CN112737627A - Radio frequency circuit, electronic device, signal processing method, and readable storage medium - Google Patents

Abstract

The application discloses a radio frequency circuit, electronic equipment, a signal processing method and a readable storage medium, and belongs to the technical field of communication. Wherein, radio frequency circuit includes: the antenna, the radio frequency transceiver, the filtering module, the antenna switch, the first low-noise amplification module and the second low-noise amplification module; the antenna is connected with a signal receiving end of the radio frequency transceiver through a first low-noise amplification module, an antenna switch, a filtering module and a second low-noise amplification module in sequence, and a control end of the first low-noise amplification module and a control end of the second low-noise amplification module are respectively connected with a first end of the radio frequency transceiver; the radio frequency transceiver controls one of the first low noise amplification module and the second low noise amplification module to be in a working state and controls the other one of the first low noise amplification module and the second low noise amplification module to be in a closed state according to the analysis condition of the received signal. The embodiment of the application can improve the receiving capability of the radio frequency circuit.

Description

Radio frequency circuit, electronic device, signal processing method and readable storage medium

technical field

The present application belongs to the field of communication technologies, and in particular relates to a radio frequency circuit, an electronic device, a signal processing method and a readable storage medium.

Background technique

With the development of communication technology, people have higher and higher requirements for the quality of radio frequency communication. In related technologies, the transmission performance of the terminal can be improved by increasing the transmission power of the power amplifier. When the radio frequency reception performance needs to be improved, in the related art, the antenna switch and filter in the radio frequency path are connected to the radio frequency transceiver through a low noise amplifier (Low Noise Amplifier, LNA) to improve the reception sensitivity. However, after adding a low-noise amplifier, the loss caused by the antenna switch and the filter itself in the radio frequency path cannot be overcome, so it is difficult to improve the radio frequency receiving performance of the terminal.

SUMMARY OF THE INVENTION

The purpose of the embodiments of the present application is to provide a radio frequency circuit, an electronic device, a signal processing method and a readable storage medium, which can improve the gain effect of the low noise amplifier and further improve the radio frequency reception performance of the radio frequency circuit.

In order to solve the above technical problems, this application is implemented as follows:

In a first aspect, an embodiment of the present application provides a radio frequency circuit, including: an antenna, a radio frequency transceiver, a filter module, an antenna switch, a first low-noise amplifying module, and a second low-noise amplifying module;

The antenna is connected to the signal receiving end of the radio frequency transceiver through the first low-noise amplifying module, the antenna switch, the filtering module and the second low-noise amplifying module in sequence, and the first low-noise amplifier The control end of the noise amplifying module and the control end of the second low-noise amplifying module are respectively connected to the first end of the radio frequency transceiver;

Wherein, the radio frequency transceiver controls one of the first low-noise amplifying module and the second low-noise amplifying module to be in a working state according to the analysis of the received signal, and controls the first low-noise amplifying module and the other of the second LNA module is turned off

In a second aspect, an embodiment of the present application provides an electronic device, including the radio frequency circuit described in the first aspect.

In a third aspect, an embodiment of the present application provides a signal processing method, which is applied to the electronic device according to the second aspect, and the signal processing method includes:

A first low-noise amplifier is used to perform a first low-noise amplification process on the radio frequency signal received by the antenna, filter processing is performed on the radio frequency signal after the first low-noise amplification process, and a first low-noise amplification process is performed on the filtered radio frequency signal. a demodulation process;

In the case that the first demodulation process does not meet the preset condition, perform response processing on the radio frequency signal after the first demodulation process;

When the first demodulation process satisfies the preset condition, the first low-noise amplifier is turned off, and a second low-noise amplifier is used to perform a second low-noise amplification process on the filtered radio frequency signal , wherein, the first demodulation process satisfies the preset condition, indicating that the demodulation fails.

In a fourth aspect, an embodiment of the present application provides an electronic device, the electronic device includes a processor, a memory, and a program or instruction stored on the memory and executable on the processor, the program or instruction being The processor implements the steps of the method according to the third aspect when executed.

In a fifth aspect, an embodiment of the present application provides a readable storage medium, where a program or an instruction is stored on the readable storage medium, and when the program or instruction is executed by a processor, the steps of the method according to the third aspect are implemented .

In a fifth aspect, an embodiment of the present application provides a chip, where the chip includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is configured to run a program or an instruction to implement the third aspect the method described.

In the embodiment of the present application, a first low-noise amplifying module is added at one end of the filter module close to the antenna, and the first low-noise amplifying module and the second low-noise amplifying module are controlled according to the analysis of the radio frequency signal received by the antenna by the radio frequency transceiver. One of the noise amplifying modules is in a working state to amplify the radio frequency signal through the first low-noise amplifying module before filtering, so as to increase the gain effect of the filter amplifier, and the external interference is large, causing the first low-noise The amplification module works in the saturation region, so that it is not convenient for the RF transceiver to analyze the RF signal, the first low-noise amplification module is turned off, and the filtered RF signal is amplified by the second low-noise amplification module. In order to overcome the inconvenient analysis of the above-mentioned radio frequency signal, the receiving capability of the radio frequency signal can be improved.

Description of drawings

1 is a circuit diagram of a radio frequency circuit provided by an embodiment of the present application;

2 is a circuit diagram of another radio frequency circuit provided by an embodiment of the present application;

3 is a flowchart of a signal processing method provided by an embodiment of the present application;

4 is a flowchart of another signal processing method provided by an embodiment of the present application;

5 is a structural diagram of an electronic device provided by an embodiment of the present application;

FIG. 6 is a structural diagram of another electronic device provided by an embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

The terms "first", "second" and the like in the description and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances so that the embodiments of the present application can be practiced in sequences other than those illustrated or described herein, and distinguish between "first", "second", etc. The objects are usually of one type, and the number of objects is not limited. For example, the first object may be one or more than one. In addition, "and/or" in the description and claims indicates at least one of the connected objects, and the character "/" generally indicates that the associated objects are in an "or" relationship.

In the related art: in order to avoid the operation of the radio frequency circuit in an operating environment with large interference, the low noise amplifier will work in a saturated state, and thus the amplified received signal cannot be analyzed by the radio frequency transceiver. A low-noise amplifier is set at the back end of the antenna switch and the antenna switch (that is, downstream along the transmission direction of the received signal), so as to pass the filtering process of the filter in advance, and then amplify the received signal, that is, in the related art, the low-noise module is placed in the filter Module and antenna switch back end. However, the transmission and processing by the filter module and the antenna switch will cause inevitable loss of the received signal, and the low-noise amplifier module cannot compensate for the loss by providing the corresponding gain, thus reducing the sensitivity of the received signal.

However, in the embodiment of the present application, low-noise amplifying modules are respectively set at the front and rear ends of the filter module and the antenna switch, so that when the filter module and the first low-noise amplifying module at the front end of the antenna switch work, it can be used in the filter module and the antenna switch. Before the antenna switch causes loss to the received signal, the received signal is amplified in advance, so as to have a better gain effect, thereby improving the receiving performance of the radio frequency circuit.

The radio frequency circuit, electronic device, signal processing method, and readable storage medium provided by the embodiments of the present application will be described in detail below with reference to the accompanying drawings through specific embodiments and application scenarios thereof.

Please refer to FIG. 1, which is a circuit diagram of a radio frequency circuit provided by an embodiment of the present application. As shown in FIG. 1, the radio frequency circuit includes: an antenna 1, a radio frequency transceiver 2, a filter module 3, an antenna switch 4, a first low noise Amplifying module 5 and second low-noise amplifying module 6 .

The antenna 1 is connected to the signal receiving end of the radio frequency transceiver 2 through the first low-noise amplifying module 5, the antenna switch 4, the filtering module 3 and the second low-noise amplifying module 6 in sequence, and the control end of the first low-noise amplifying module 5 and The control terminals of the second low-noise amplifying module 6 are respectively connected with the first terminals of the radio frequency transceiver 2;

Among them, the radio frequency transceiver 2 controls one of the first low-noise amplifying module 5 and the second low-noise amplifying module 6 to be in a working state, and controls the first low-noise amplifying module 5 and the second low-noise amplifying module 5 according to the analysis of the received signal. The other one of the noise amplifying modules 6 is turned off.

It should be noted that in some operating environments, the above-mentioned first low-noise amplifying module 5 is not suitable. For example, the operating environment of the above-mentioned radio frequency circuit has great interference, so that the first low-noise amplifying module 5 works in saturation. In the case of the state, the received signal amplified by the first low-noise amplifying module 5 cannot be accurately adjusted by the radio frequency transceiver 2 . At this time, the radio frequency transceiver 2 will switch the operating low-noise amplifier to the second low-noise amplifying module 6 according to the analysis of the received signal, so that the second low-noise amplifying module 6 performs the filtering module 3 on the received signal. After the filtering process, the received signal is further amplified, so as to prevent the second low-noise amplifying module 6 from working in a saturated state due to a large interference signal, thereby improving the reliability of the received signal.

In an optional implementation manner, the above-mentioned radio frequency transceiver 2 controls one of the first low-noise amplifying module 5 and the second low-noise amplifying module 6 to be in a working state according to the analysis of the received signal, which can be understood as: The radio frequency transceiver 2 respectively controls the first low-noise amplifying module 5 or the second low-noise amplifying module 6 to be in the working state, and obtains the analysis situation of the received signal respectively, and then compares the advantages and disadvantages of the analysis situation under the two different working states degree, to select a low-noise amplifier module that is in the working state when the RF resolution is better, and continues to be in the working state.

In this way, the radio frequency transceiver 2 can select one of the first low-noise amplifying module 5 and the second low-noise amplifying module 6 whose amplification processing effect is more matched with the current radio frequency operating environment, so as to control the selected one to be in a working state, Thus, the amplification effect of the received signal is improved.

In another optional embodiment, the above-mentioned radio frequency transceiver 2 controls one of the first low-noise amplifying module 5 and the second low-noise amplifying module 6 to be in a working state according to the analysis of the received signal. It can also be understood that That is: the above-mentioned radio frequency transceiver 2 can preferentially control the first low-noise amplifying module 5 to be in a working state, and obtain the analysis of the received signal, and if the analysis of the received signal fails, the first low-noise amplifying module 5 is turned off, And start the second low-noise amplifying module 6; otherwise, control the first low-noise amplifying module 5 to keep in the working state.

It should be noted that the above-mentioned first low-noise amplifying module 5 or the second low-noise amplifying module 6 is in an off state, which can be understood as: the first low-noise amplifying module 5 or the second low-noise amplifying module 6 is short-circuited or in a short-circuit state Down.

In this embodiment, the first low-noise amplifying module 5 is preferentially used to amplify the received signal before filtering, and when the first low-noise amplifying module 5 may cause the radio frequency transceiver to be unable to adjust the received signal, it is switched to enable The second low-noise amplifying module 6 . Compared with the previous embodiment, it can be avoided that under the applicable operating environment of the first low-noise amplifying module 5, it is necessary to perform: respectively controlling the first low-noise amplifying module 5 or the second low-noise amplifying module 6 to be in the working state, and Obtain the analysis of the received signal separately, and then compare the pros and cons of the analysis in two different working states to select and start the complex process of a low-noise amplifier module that is more favorable to the RF analysis.

In the embodiment of the present application, a first low-noise amplifying module is added at one end of the filter module close to the antenna, and the first low-noise amplifying module and the second low-noise amplifying module are controlled according to the analysis of the radio frequency signal received by the antenna by the radio frequency transceiver. One of the noise amplifying modules is in a working state to amplify the radio frequency signal through the first low-noise amplifying module before filtering, so as to increase the gain effect of the filter amplifier, and the external interference is large, causing the first low-noise The amplification module works in the saturation region, so that it is not convenient for the RF transceiver to analyze the RF signal, the first low-noise amplification module is turned off, and the filtered RF signal is amplified by the second low-noise amplification module. In order to overcome the inconvenient analysis of the above-mentioned radio frequency signal, the receiving capability of the radio frequency signal can be improved.

As an optional implementation manner, as shown in FIG. 2 , the first low-noise amplifier module 5 includes: a first low-noise amplifier 51 and a first bypass switch 52 connected in parallel with the first low-noise amplifier 51 ;

The second low noise amplifier module 6 includes: a second low noise amplifier 61 and a second bypass switch 62 connected in parallel with the second low noise amplifier 61;

The control terminal of the first low noise amplification module 5 is the control terminal of the first bypass switch 52 , and the control terminal of the second low noise amplification module 6 is the control terminal of the second bypass switch 62 ;

Wherein, when the first bypass switch 52 is in an on state, the first low noise amplifier module 5 is in an off state; when the first bypass switch 52 is in an off state, the first low noise amplifier module 5 is in an off state. The noise amplification module 5 is in working state;

When the second bypass switch 62 is in an on state, the second low noise amplifier module 6 is in an off state; when the second bypass switch 62 is in an off state, the second low noise amplifier module 6 is in an off state. The noise amplification module 6 is in working state.

As shown in FIG. 2 , when the radio frequency transceiver controls the above-mentioned first bypass switch 52 to be closed, the branch where the first bypass switch 52 is located short-circuits the first low-noise amplifier 51, so as to control the first low-noise amplifier to be in the Off state; Correspondingly, when the radio frequency transceiver controls the first bypass switch 52 to be disconnected, the branch where the first bypass switch 52 is located is disconnected, so that the first low noise amplifier 51 is not short-circuited, so that the radio frequency The received signal in the channel can only be transmitted from the first low-noise amplifier 51, so that the first low-noise amplifier can be controlled to be in a working state.

For the above-mentioned process of adjusting the working state of the second low noise amplifier 61 by controlling the on-off state of the second bypass switch 62, and the above-mentioned process of adjusting the first low-noise amplifier 61 by controlling the on-off state of the first bypass switch 52 The process of the working state of the amplifier 51 is the same, and will not be repeated here.

It should be noted that, in the implementation, there may be a situation where the working bandwidth of one low noise amplifier is not enough to completely cover the working frequency of the radio frequency circuit, then multiple low noise amplifiers respectively targeting different working frequencies may be set.

As an optional implementation manner, as shown in FIG. 2 , the first low-noise amplifying module 5 includes at least two first low-noise amplifiers 51 connected in series, and each first low-noise amplifier 51 is connected to one first low-noise amplifier 51 respectively. A bypass switch 52 is connected in parallel, and different first low-noise amplifiers 51 correspond to different frequency levels;

Wherein, when the operating frequency of the radio frequency circuit matches the frequency level of the target first low noise amplifier, the radio frequency transceiver 2 first controls the target first bypass switch to be in an off state, and controls the second bypass switch The switch 62 is in a conducting state, and then demodulates the received signal after the first low-noise amplifying module 5 performs the first low-noise amplifying process, and controls the target first bypass switch to be on when the demodulation fails. state, and control the second bypass switch 62 to be in an off state;

The target first bypass switch is a first bypass switch 52 connected in parallel with the target first low-noise amplifier, and the first bypass switch 52 connected in parallel with other first low-noise amplifiers 51 is in a conducting state, The series-connected at least two first low noise amplifiers 51 include the target first low noise amplifier.

In implementation, the above-mentioned first bypass switches 52 connected in parallel with the at least two first low-noise amplifiers 51 may be single-pole single-throw switches that are independent of each other, or the above-mentioned first bypass switches 52 connected in parallel with the at least two first low-noise amplifiers 51 respectively. The first bypass switch 52 can also be located in the same device. For example, in the case where the number of the first low noise amplifiers 51 is two, a double-pole double-throw switch can be set to pass the double-pole double-throw switch. Realize the function of the first bypass switch 52 connected in parallel with the two first low-noise amplifiers 51 respectively, which is not specifically limited here.

It should be noted that, when the first low-noise amplifier module 5 is in the working state, at the same time, among the at least two first low-noise amplifiers 51, only one first low-noise amplifier 51 is in the working state , the other first low noise amplifiers 51 are all in the off state, that is, in the first bypass switch 52 connected in parallel with the at least two first low noise amplifiers 51 respectively, at the same time, there is only one first bypass switch 52 is in an open state, and the other first bypass switches 52 are in a closed state.

In addition, the above-mentioned different first low noise amplifiers 51 correspond to different frequency levels, which can be understood as: different first low noise amplifiers 51 have different frequency ranges of the received signals that can be effectively amplified. For example, as shown in FIG. 2 , The first low-noise amplifier module 5 includes three first low-noise amplifiers, which are: a first low-frequency low-noise amplifier LNA-L, a first low-frequency medium-noise amplifier LNA-M, and a first high-frequency low-noise amplifier LNA-H .

Correspondingly, after the radio frequency transceiver 2 controls the target first bypass switch to be in an off state and controls the second bypass switch 62 to be in an on state, if the first low-noise amplification module 5 is subjected to the first low-noise amplification process If the demodulation of the received signal succeeds, then continue to keep the target first bypass switch in the off state, and the second bypass switch 62 in the on state, specifically: the interference strength in the operating environment of the above-mentioned radio frequency circuit When it is smaller, control the first low-noise amplifying module 5 to be in a working state, and select a first low-noise amplifier 51 with a frequency level matching the current operating frequency of the radio frequency circuit from the first low-noise amplifying module 5 to control its In the working state, and control the other first low-noise amplifiers 51 to be in the off state, and because the interference intensity in the operating environment of the radio frequency circuit is small, so that the first low noise amplifier of the frequency level that matches the current working frequency of the radio frequency circuit is passed. The radio frequency signal processed by a low noise amplifier 51 is less disturbed by the environment, so that it can be demodulated by the radio frequency transceiver 2 .

For example, as shown in FIG. 2 , it is assumed that the first low-noise amplifier module 5 includes: LNA-L, LNA-M, and LNA-H, and when the radio frequency circuit works in the high frequency mode, the radio frequency transceiver 2 will control the The first bypass switch 52 connected in parallel with LNA-H is opened, and controls the first bypass switches 52 connected to LNA-L and LNA-M, respectively, to be closed.

In this embodiment, a plurality of first low-noise amplifiers 51 with different frequency levels are set in the first low-noise amplifying module 5 to increase the coverage of the frequency levels of the first low-noise amplifying module 5 .

As an optional implementation manner, as shown in FIG. 2 , the second low-noise amplifier module 6 includes at least two second low-noise amplifiers 61 connected in series, and each second low-noise amplifier 61 is connected to a second side The circuit switches 62 are connected in parallel, and the frequency levels corresponding to different second low-noise amplifiers 61 are different;

Wherein, when the operating frequency of the radio frequency circuit matches the frequency level of the target second low noise amplifier, if the radio frequency transceiver 2 fails to demodulate the received signal after the first low noise amplification processing, the radio frequency transceiver The machine 2 controls the first bypass switch 52 to be in an on state, and controls the target second bypass switch to be in an off state;

The target second bypass switch is a second bypass switch connected in parallel with the target second low noise amplifier, and the second bypass switch connected in parallel with other second low noise amplifiers is in a conducting state, the series connection The at least two second low noise amplifiers include the target second low noise amplifier.

Wherein, the above-mentioned process of selecting the target second low-noise amplifier from at least two second low-noise amplifiers is the same as the process of selecting the target first low-noise amplifier from at least two first low-noise amplifiers in the above embodiment , and can also improve the matching degree between the frequency level of the second low-noise amplifying module 6 and the operating frequency of the radio frequency circuit, thereby improving the amplification processing effect of the received signal, thereby improving the receiving performance of the radio frequency circuit, which will not be repeated here. .

It should be noted that, in the embodiment shown in FIG. 2 , at least two second low-noise amplifiers 61 in the second low-noise amplifying module 6 are connected in parallel with each other, so that the second low-noise amplifying module 6 can be composed of two One or more than two second low-noise amplifiers 61 may be in the working state at the same time, that is, the number of the above-mentioned target second low-noise amplifier core target second bypass switch may be greater than one.

In this way, multiple second low-noise amplifiers 61 can be in working state at the same time, that is, the number of second low-noise amplifiers 61 included in the target second low-noise amplifier can be one or more than one. The method of combining the second low-noise amplifiers 61 with different parameters can expand the frequency coverage of the second low-noise amplifier module 6 .

Of course, in a specific implementation, at least two second low noise amplifiers 61 in the second low noise amplifier module 6 can also be connected in series, and only one of the second low noise amplifiers 61 is activated each time, which is not described here. limited.

It should be noted that with the development of science and technology, the frequency coverage of the low noise amplifier will become wider and wider. When a low noise amplifier is sufficient to cover the operating frequency of the above-mentioned radio frequency circuit, only one first frequency can be set in the radio frequency circuit. A low-noise amplifier 51 and/or only one second low-noise amplifier 61 is provided. In the embodiment shown in FIG. 2 , the radio frequency circuit with multiple first low-noise amplifiers 51 and multiple second low-noise amplifiers 61 is only used as a For example, the numbers of the first low noise amplifier 51 and the second low noise amplifier 61 are not specifically limited here.

As an optional implementation manner, as shown in FIG. 2 , the filtering module 3 includes N filters 31, and different filters 31 correspond to different working frequency bands, the antenna switch 4 is a single-pole N-throw switch, and N is an integer greater than 1;

The output end of the first low-noise amplifier module 5 is connected to the first end (fixed end) of the single-pole N-throw switch 4, and the N second ends (moving ends) of the single-pole N-throw switch 4 are respectively connected to the N The input ends of the filters 31 are connected, and the output ends of the N filters 31 are respectively connected with the input ends of the second low-noise amplifying module 6 .

In implementation, the filters 31 with different working frequency bands can have better filtering effect on the received signals in the corresponding working frequency bands. A plurality of filters 31 corresponding to different working frequency bands are arranged in the radio frequency circuit, so that during operation, according to the different working frequencies of the radio frequency circuit, the antenna switch 4 is controlled to connect one or more filters 31 corresponding to the working frequency. In the radio frequency channel, the one or more filters 31 are activated to perform filtering, so as to improve the accuracy of the filtering module.

It should be noted that, in the embodiment shown in FIG. 2 , N is equal to 8 as an example for illustration, and the number of filters 31 and the specific structure of the antenna switch 4 are not specifically limited here.

As an optional implementation manner, as shown in FIG. 2 , the second low noise amplifier module 6 includes M second low noise amplifiers 61 , M second bypass switches 62 and M switch switches 63 , where M is greater than an integer of 1;

The M second bypass switches 62 are respectively connected in parallel with the M second low noise amplifiers 61 , and the control terminals of the second low noise amplifier module 6 include the control terminals of the M second bypass switches 62 ;

The input ends of the M second low-noise amplifiers 61 are respectively connected to the output ends of the N filters 31 through the M switches 63;

The control terminals of the M switches 63 are respectively connected with the radio frequency transceiver 2;

Wherein, when the second low-noise amplifier module 6 is in the working state, the target filter is connected to the radio frequency transceiver 2 through the target switch and the target second low-noise amplifier;

When the second low-noise amplifying module 6 is in an off state, the target filter is connected to the radio frequency transceiver 2;

The target filter and the target second low noise amplifier are respectively matched with the operating frequency of the radio frequency circuit, the target second bypass switch is connected in parallel with the target second low noise amplifier, and the target switch is connected between the target second low noise amplifier and the target filter.

In a specific implementation, when the second low-noise amplifier module 6 is in an off state, the target filter can be connected to the radio frequency transceiver 2 through the target switch and the second bypass switch 62, or the target filter can also be connected to the radio frequency transceiver 2. The connection with the radio frequency transceiver 2 can be realized through the switch connected between the filter module 3 and the radio frequency transceiver 2, and in the embodiment shown in FIG. 2, only the target filter can pass through the target switch and the second bypass. The connection between the switch 62 and the radio frequency transceiver 2 is taken as an example, which is not specifically limited here.

It should be noted that the number of the above-mentioned target filters and target second low-noise amplifiers may be one or more than one. In implementation, one or more corresponding filters may be selected according to the frequency band where the actual operating frequency of the radio frequency circuit is located. The device 31 works, and one or more second low-noise amplifiers 61 may also be selected to work, so as to better achieve the amplification effect of the received signal, which is not specifically limited here.

It should be noted that, in the embodiment shown in FIG. 2 , M is equal to 5, and the five second low-noise amplifiers include: a low-frequency second low-noise amplifier LNA0, two intermediate-frequency second low-noise amplifiers (LNA1 and LNA2), and Two high-frequency second low noise amplifiers (LNA3 and LNA4), 5 switches including: single-pole five-throw switch SW1, single-pole three-throw switch SW2 and three single-pole four-throw switches (SW3, SW4 and SW5).

In addition, in the embodiment shown in FIG. 2 , the number of filters 31 is 8, and the working frequency bands of the 8 filters 31 are respectively standard frequency bands: B1, B3, B5, B7, B8, B34, B39, B40 and B41 .

At this time, the specific connection relationship between the switch 63 and the second low noise amplifier 62 is as follows: the fixed terminal of SW1 is connected to the input terminal of LNA0, the fixed terminal of SW2 is connected to the input terminal of LNA1, and the fixed terminal of SW3 is connected to the input terminal of LNA2. The input terminal is connected, the fixed terminal of SW4 is connected to the input terminal of LNA3, and the active terminals of SW1, SW2, SW3 and SW4 are connected in parallel, so as to be able to be connected to any filter 31 among the 8 filters 31.

In this embodiment, selection of radio frequency paths in multiple frequency bands can be realized by switching switches, so as to select a low-noise path with minimum radio frequency loss from multiple radio frequency paths, so as to further improve the receiving performance of the radio frequency circuit.

It should be noted that the specific structure of the above-mentioned switch is not limited to the above-mentioned single-pole three-throw, single-pole four-throw or single-pole five-throw, which can be determined according to the number of filters and the corresponding working frequency band, the number of second low noise amplifiers and The working frequency band, etc., can be adaptively changed, which is not specifically limited here.

In addition, in practical applications, the radio frequency circuit may include multiple antennas. Based on the change of the number of antennas, the number of the first low-noise amplifying module, the second low-noise amplifying module and the filtering module may be increased adaptively. The number of the first low-noise amplifying module, the second low-noise amplifying module and the filtering module in the radio frequency circuit is limited.

In the radio frequency circuit shown in Figure 2, if the working frequency of the radio frequency circuit is located in the low frequency B5/B8 frequency band, its specific working process may include the following steps:

Step 1. At this time, LNA-H and LNA-M are in a closed state, and the low-frequency useful signal is transmitted to LNA-L through the first bypass switch of LNA-H and the first bypass switch of LNA-M. The loss of the signal is very small. While LNA-L is in working state, its bypass switch is open, so LNA-L amplifies the received signal, and then transmits it to the RF through the single-pole 8-throw switch, B5/B8 filter, SW1 and LNA0 bypass switch Transceiver 2.

In implementation, the noise figure in the above RF circuit can be expressed as the following formula:

Among them, F _total represents the noise figure, F ₁ represents the noise figure of the first stage, and G ₁ represents the gain coefficient of the first stage.

The first low-noise amplifying module 5 and the second low-noise amplifying module 6 in the radio frequency circuit provided by the embodiment of the present application can be applied to the first-stage noise reduction processing, and it can be seen from the above disclosure that due to the second low-noise amplifying module at the front end Module 6 is short-circuited by the bypass switch, therefore, only the loss caused by the bypass switch (about 0.2dB-0.3dB) can be considered, and the noise figure (NF) can be reduced by 2-3dB

Step 2: The radio frequency transceiver 2 determines whether the received signal can be demodulated.

In implementation, if the above demodulation fails, it may be caused by the following two situations:

Case 1: LNA-L is saturated due to the presence of interfering signals out of band;

Case 2: No useful signal input.

If the above adjustment fails, go to step 3.

Step 3. The radio frequency transceiver 2 controls the first low-noise amplifying module 5 and the second low-noise amplifying module 6 to adjust the working state, that is, when the LNA-L, LNA-H and LNA-M are all turned off, the low-frequency useful signals pass through in sequence. The bypass switches of LNA-L, LNA-H and LNA-M are then transmitted to the LNA0 through the single-pole 8-throw switch, B5/B8 filter, and SW1. At this time, LNA0 is in the working state to amplify the low-frequency signal. After processing, it is transmitted to the radio frequency transceiver 2 .

Step 4. The radio frequency transceiver 2 judges again whether the received signal can be demodulated. If it still cannot be demodulated, it is adjusted to the working state of the radio frequency circuit in step 1 to receive the signal; if it can be demodulated, continue Maintain the working state of the radio frequency circuit in this step to receive the signal, and perform bit error rate supervision on the received signal every preset time length (assuming 1ms). Specifically, if the bit error rate of the demodulated signal is If it is greater than or equal to the preset value, adjust to the working state of the radio frequency circuit in step 1 to receive the signal.

In this step, in the above-mentioned situation that the demodulation still cannot be performed, it means that the signal received on the radio frequency circuit is an interference signal (that is, no useful signal is received). In addition, in the above case that the demodulation is possible, but the bit error rate of the demodulated signal is greater than or equal to the preset value, it means that the operating environment of the radio frequency circuit has changed, or the signal quality of the received signal has changed, so that the second The low-noise amplifying module cannot satisfy the gain effect of the amplifying processing on the received signal, so the first low-noise amplifying module is switched to perform amplifying processing on the received signal.

Correspondingly, when the operating frequency of the radio frequency circuit is located in the intermediate frequency B1/B3 frequency band, it is determined whether to amplify the received signal through the LNA-M or to process the received signal through the LNA1. When the operating frequency is in the high frequency B40/B41 frequency band, it is judged whether to amplify the received signal through LNA-H or to process the received signal through LNA3, which is the same as the above-mentioned operating frequency of the radio frequency circuit in the low frequency B5. In the case of the /B8 frequency band, the process of judging whether to amplify the received signal through the LNA-L or to process the received signal through the LNA0 is similar, and will not be repeated here.

An embodiment of the present application further provides an electronic device, where the electronic device includes the radio frequency circuit in the circuit embodiment shown in FIG. 1 or FIG. 2 .

In implementation, the above-mentioned electronic device may be a mobile electronic device or a non-mobile electronic device. Exemplarily, the mobile electronic device may be a mobile phone, a tablet computer, a notebook computer, a palmtop computer, an in-vehicle electronic device, a wearable device, an ultra-mobile personal computer (UMPC), a netbook, or a personal digital assistant (personal digital assistant). assistant, PDA), etc., the non-mobile electronic device may be a personal computer (personal computer, PC), a television (television, TV), a teller machine or a self-service machine, etc., which are not specifically limited in the embodiments of the present application.

In application, the above-mentioned electronic device can select one of the first low-noise amplifying module and the second low-noise amplifying module to be in a working state according to the interference intensity in a specific working environment, so as to provide a better gain configuration, thereby improving the electronic The signal reception capability of the device.

Please refer to FIG. 3 , which is a flowchart of a signal processing method provided by an embodiment of the present application. The signal processing method can be applied to the electronic device provided in the previous embodiment. As shown in FIG. 3 , the method may include the following steps :

Step 301: Use a first low-noise amplifier to perform a first low-noise amplification process on the radio frequency signal received by the antenna, filter the radio frequency signal after the first low-noise amplification process, and perform a first low-noise amplification process on the filtered radio frequency signal. The signal undergoes a first demodulation process.

In a specific implementation, the radio frequency signal received by the above-mentioned antenna may include: useful signals sent by the radio frequency signal transmitter to the electronic device, and interference signals in the operating environment where the radio frequency circuit is located.

In this embodiment, the above-mentioned first low-noise amplifier is used to perform first low-noise amplification processing on the radio frequency signal received by the antenna, filter processing is performed on the radio frequency signal after the first low-noise amplification processing, and the filtering processing is performed on the first low-noise amplifier. The specific process of performing the first demodulation processing on the obtained radio frequency signal is the same as in the embodiment shown in FIG. 1 or FIG. 2 , controlling the first low-noise amplifying module to be in a working state, and controlling the second low-noise amplifying module to be in an off state The processing process is the same, and will not be repeated here.

Step 302: In the case that the first demodulation process does not meet the preset condition, perform response processing on the radio frequency signal after the first demodulation process.

In a specific implementation, the preset conditions may include: demodulation fails, or the bit error rate after demodulation is greater than the preset bit error rate, etc. If the above-mentioned first demodulation process does not meet the preset conditions, it indicates that The received signal is decoded and identified, and corresponding response processing is performed on the decoded signal. The specific meaning of the response processing is the same as the process of responding to the received radio frequency signal in the prior art, and will not be repeated here.

Step 303: In the case that the first demodulation process satisfies the preset condition, turn off the first low-noise amplifier, and use a second low-noise amplifier to perform a second low-noise signal on the filtered radio frequency signal. Noise amplification processing, wherein the first demodulation processing satisfies a preset condition indicates that the demodulation fails.

In the implementation, the above-mentioned specific process of turning off the first low-noise amplifier and using the second low-noise amplifier to perform the second low-noise amplification processing on the filtered radio frequency signal is the same as that shown in FIG. 1 or FIG. 2 . In the embodiment, the process of controlling the second low-noise amplifying module to be in the working state and controlling the first low-noise amplifying module to be in the off state is the same, which is not repeated here.

Optionally, after the second low-noise amplification is performed on the filtered radio frequency signal by using a second low-noise amplifier, the method further includes:

performing a second demodulation process on the radio frequency signal after the second low-noise amplification process;

When the second demodulation process satisfies the preset condition, the first low-noise amplifier is turned on, and the second low-noise amplifier is turned off, so as to use the first low-noise amplifier before the filtering process The noise amplifier performs the first low-noise amplification process on the radio frequency signal;

or,

In the case that the second demodulation process does not satisfy the preset condition, a response process is performed on the radio frequency signal after the second demodulation process.

In an implementation, in the above-mentioned condition that the second demodulation process satisfies the preset condition, the first low-noise amplifier is turned on, and the second low-noise amplifier is turned off, so that before the filtering process, the first low-noise amplifier is turned on. The process that the first low-noise amplifier performs the first low-noise amplifying process on the radio frequency signal is the same as the process after the demodulation of the second low-noise amplifying module fails in the embodiment shown in FIG. 1 or FIG. 2 . The processing process is the same; in addition, the above-mentioned process of responding to the radio frequency signal after the second demodulation process under the condition that the second demodulation process does not meet the preset condition is the same as that shown in FIG. 1 or FIG. In the embodiment shown in 2, the processing process after the successful demodulation of the second low-noise amplifying module is the same, and has the same beneficial effects, which will not be repeated here.

Optionally, when at least one of the first demodulation process and the second demodulation process does not satisfy a preset condition, the method further includes:

detecting the bit error rate of the demodulated signal corresponding to the radio frequency signal;

When the bit error rate is greater than or equal to a preset value, the radio frequency signal is ignored, the first low noise amplifier is turned on, and the second low noise amplifier is turned off.

In this embodiment, as in the embodiment shown in FIG. 2 , the process of performing bit error rate supervision on the received signal every preset time length (assuming 1ms) is the same, and the same beneficial effects can be obtained. Here No longer.

Optionally, in the case that the number of the first low-noise amplifiers is at least two, the first low-noise amplification processing performed on the radio frequency signal received by the antenna by using the first low-noise amplifier includes:

A target first low-noise amplifier matching the target frequency band is used to perform first low-noise amplification processing on the radio frequency signal received by the antenna, wherein the target frequency band is the frequency band of the radio frequency signal received by the antenna, and the at least two first a low noise amplifier including the target first low noise amplifier;

and / or,

When the number of the second low-noise amplifiers is at least two, the second low-noise amplifying process on the filtered radio frequency signal by using the second low-noise amplifier includes:

The radio frequency signal received by the antenna is subjected to second low-noise amplification processing by using a target second low-noise amplifier matching the target frequency band, wherein the at least two second low-noise amplifiers include the target second low-noise amplifier.

This embodiment can be applied to an electronic device including a plurality of first low-noise amplifiers or a radio frequency circuit including a plurality of second low-noise amplifiers (for example, the radio frequency circuit shown in FIG. The working frequency selects the low noise amplifier with the best gain effect from the first low noise amplifier or the second low noise amplifier to amplify the received signal, so as to further improve the gain effect, thereby improving the receiving performance of the electronic device at the working frequency.

The signal processing method provided in this embodiment can implement various processes of the radio frequency circuit provided in the circuit embodiment shown in FIG. 1 or FIG. 2 , and can achieve the same beneficial effects, which are not repeated here to avoid repetition.

The signal processing method provided by the embodiment of the present application is illustrated below by taking the application to the terminal device having the radio frequency circuit shown in FIG. 2 as an example:

As shown in FIG. 4 , the signal processing method provided by the embodiment of the present application may include the following steps:

Step 401: Determine the working frequency band of the terminal.

This step may specifically be: determining whether the working frequency band of the terminal is a low frequency, an intermediate frequency or a high frequency.

Step 402: Select one of the LNA-L, LNA-M and LNA-H that matches the above-mentioned working frequency band to work first.

This step may specifically be: when the working frequency band of the terminal is a low frequency, select the LNA-L to be in the working state; when the working frequency band of the terminal is an intermediate frequency, select the LNA-M to be in the working state; When the frequency band is high frequency, select LNA-H to be in working state.

Step 403 , the received signal is transmitted to the second low-noise amplifying module 6 through the first low-noise amplifying module 5 , the antenna switch 4 and the filtering module 3 in sequence.

In step 404 , LNA0 , LNA1 , LNA2 and LNA3 are all turned off, and the received signal is transmitted to the radio frequency transceiver 2 through its bypass (the bypass where the second bypass switch 62 is located).

Step 405: The radio frequency transceiver 2 determines whether the received signal can be demodulated.

Wherein, if the judgment result of this step is "Yes", step 406 is executed; if the judgment result of this step is "No", step 407 is executed.

Step 406 , maintain the current communication state, and detect the signal quality every 1 ms.

In this step, the signal quality of the received signal can be judged by detecting the bit error rate after demodulation of the received signal. When the bit error rate is greater than a preset value, it means that the signal quality of the received signal is poor, so the switch to the above-mentioned The working state of the radio frequency circuit in steps 402 to 404; otherwise, the current communication state is maintained until the communication is completed.

Step 407: Turn off LNA-L, LNA-M and LNA-H.

Step 408 , the received signal is transmitted to the second low-noise amplifying module 6 through the bypass in the first low-noise amplifying module 5 (the bypass where the first bypass switch 52 is located), the antenna switch 4 and the filtering module 3 in sequence.

Step 409 : Select at least one operation from LNA0 , LNA1 , LNA2 and LNA3 that matches the above-mentioned operating frequency band, and select a low-noise channel to transmit the received signal to the radio frequency transceiver.

In this step, the above-mentioned received signal is transmitted to the radio frequency transceiver by selecting a low-noise channel, which can be understood as: selecting the one with the lowest noise figure from the plurality of filters and the plurality of second low-noise amplifiers 61 through the antenna switch 4, the switch 63, etc. One or more, so that the received signal is transmitted through the selected target filter and the radio frequency channel where the target second low-noise amplifier is located.

The signal processing method provided in this embodiment can perform each process of the radio frequency circuit shown in FIG. 2 , and can achieve the same beneficial effects. To avoid repetition, details are not described here.

Optionally, as shown in FIG. 5 , an embodiment of the present application further provides an electronic device 500, including a processor 501, a memory 502, a program or instruction stored in the memory 502 and executable on the processor 501, When the program or instruction is executed by the processor 501, each process of the above-mentioned signal processing method embodiments can be implemented, and the same technical effect can be achieved. To avoid repetition, details are not repeated here.

It should be noted that the electronic devices in the embodiments of the present application include the aforementioned mobile electronic devices and non-mobile electronic devices.

FIG. 6 is a schematic diagram of a hardware structure of an electronic device implementing an embodiment of the present application.

The electronic device 600 includes but is not limited to: a radio frequency unit 601, a network module 602, an audio output unit 603, an input unit 604, a sensor 605, a display unit 606, a user input unit 607, an interface unit 608, a memory 609, and a processor 610, etc. part.

Those skilled in the art can understand that the electronic device 600 may also include a power source (such as a battery) for supplying power to various components, and the power source may be logically connected to the processor 610 through a power management system, so as to manage charging, discharging, and power management through the power management system. consumption management and other functions. The structure of the electronic device shown in FIG. 6 does not constitute a limitation on the electronic device, and the electronic device may include more or less components than those shown in the figure, or combine some components, or arrange different components, which will not be repeated here. .

The radio frequency unit 601 is configured to use a first low noise amplifier to perform first low noise amplification processing on the radio frequency signal received by the antenna, filter the radio frequency signal after the first low noise amplification processing, and perform the first low noise amplification processing on the radio frequency signal. performing first demodulation processing on the filtered radio frequency signal;

a processor 610, configured to perform response processing on the radio frequency signal after the first demodulation processing when the first demodulation processing does not meet a preset condition;

The radio frequency unit 601 is further configured to turn off the first low-noise amplifier under the condition that the first demodulation process satisfies the preset condition, and use the second low-noise amplifier to process the filtered radio frequency signal A second low-noise amplification process is performed, wherein the first demodulation process satisfies a preset condition indicating that the demodulation fails.

Optionally, after the radio frequency unit 601 performs the second low noise amplification process on the filtered radio frequency signal by using the second low noise amplifier;

The radio frequency unit 601 is further configured to perform second demodulation processing on the radio frequency signal after the second low noise amplification processing;

The radio frequency unit 601 is further configured to start the first low-noise amplifier and turn off the second low-noise amplifier under the condition that the second demodulation process satisfies the preset condition, so that the filtering process Performing the first low-noise amplification process on the radio frequency signal by using the first low-noise amplifier before;

The processor 610 is further configured to perform response processing on the radio frequency signal after the second demodulation processing if the second demodulation processing does not meet the preset condition.

Optionally, when it is determined that at least one of the first demodulation process and the second demodulation process does not satisfy a preset condition, the processor 610 is further configured to:

detecting the bit error rate of the demodulated signal corresponding to the radio frequency signal;

When the bit error rate is greater than or equal to a preset value, the radio frequency signal is ignored, and the radio frequency unit 601 is controlled to activate the first low-noise amplifier and turn off the second low-noise amplifier.

Optionally, when the number of the first low-noise amplifiers is at least two, the first low-noise amplification process performed by the radio frequency unit 601 on the radio frequency signal received by the antenna by using the first low-noise amplifier includes: :

A target first low-noise amplifier matching the target frequency band is used to perform first low-noise amplification processing on the radio frequency signal received by the antenna, wherein the target frequency band is the frequency band of the radio frequency signal received by the antenna, and the at least two first a low noise amplifier including the target first low noise amplifier;

and / or,

When the number of the second low-noise amplifiers is at least two, the second low-noise amplifying process on the filtered radio frequency signal by using the second low-noise amplifier includes:

The radio frequency signal received by the antenna is subjected to second low-noise amplification processing by using a target second low-noise amplifier matching the target frequency band, wherein the at least two second low-noise amplifiers include the target second low-noise amplifier.

The electronic device provided by the embodiment of the present application can perform each step in the method embodiment shown in FIG. 3 or FIG. 4 , and can realize each working process of the radio frequency circuit shown in FIG. 1 or FIG. Or the same beneficial effects of the radio frequency circuit shown in FIG. 2 are not repeated here in order to avoid repetition.

It should be understood that, in this embodiment of the present application, the input unit 604 may include a graphics processor (Graphics Processing Unit, GPU) and a microphone, and the graphics processor pair is obtained by an image capture device (such as a camera) in a video capture mode or an image capture mode The image data of still pictures or videos is processed. The display unit 606 may include a display panel, which may be configured in the form of a liquid crystal display, an organic light emitting diode, or the like. The user input unit 607 includes a touch panel and other input devices. Touch panel, also known as touch screen. The touch panel may include two parts, a touch detection device and a touch controller. Other input devices may include, but are not limited to, physical keyboards, function keys (such as volume control keys, switch keys, etc.), trackballs, mice, and joysticks, which will not be repeated here. Memory 609 may be used to store software programs as well as various data, including but not limited to application programs and operating systems. The processor 610 may integrate an application processor and a modem processor, wherein the application processor mainly processes an operating system, a user interface, and an application program, and the like, and the modem processor mainly processes wireless communication. It can be understood that, the above-mentioned modulation and demodulation processor may not be integrated into the processor 610.

Embodiments of the present application further provide a readable storage medium, where a program or an instruction is stored on the readable storage medium. When the program or instruction is executed by a processor, each process of the above-mentioned signal processing method embodiment can be achieved, and the same can be achieved. In order to avoid repetition, the technical effect will not be repeated here.

Wherein, the processor is the processor in the electronic device described in the foregoing embodiments. The readable storage medium includes a computer-readable storage medium, such as a computer read-only memory (Read-Only Memory, ROM), a random access memory (Random Access Memory, RAM), a magnetic disk or an optical disk, and the like.

An embodiment of the present application further provides a chip, where the chip includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is configured to run a program or an instruction to implement the signal processing method embodiments described above. Each process can achieve the same technical effect. In order to avoid repetition, it will not be repeated here.

It should be understood that the chip mentioned in the embodiments of the present application may also be referred to as a system-on-chip, a system-on-chip, a system-on-a-chip, or a system-on-a-chip, or the like.

It should be noted that, herein, the terms "comprising", "comprising" or any other variation thereof are intended to encompass non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements, It also includes other elements not expressly listed or inherent to such a process, method, article or apparatus. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in a process, method, article or apparatus that includes the element. Furthermore, it should be noted that the scope of the methods and apparatus in the embodiments of the present application is not limited to performing the functions in the order shown or discussed, but may also include performing the functions in a substantially simultaneous manner or in the reverse order depending on the functions involved. To perform functions, for example, the described methods may be performed in an order different from that described, and various steps may also be added, omitted, or combined. Additionally, features described with reference to some examples may be combined in other examples.

From the description of the above embodiments, those skilled in the art can clearly understand that the method of the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course can also be implemented by hardware, but in many cases the former is better implementation. Based on this understanding, the technical solution of the present application can be embodied in the form of a software product in essence or in a part that contributes to the prior art, and the computer software product is stored in a storage medium (such as ROM/RAM, magnetic disk, CD-ROM), including several instructions to make a terminal (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) execute the methods described in the various embodiments of this application.

The embodiments of the present application have been described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific embodiments, which are merely illustrative rather than restrictive. Under the inspiration of this application, without departing from the scope of protection of the purpose of this application and the claims, many forms can be made, which all fall within the protection of this application.

Claims (13)

1. A radio frequency circuit, comprising: the antenna, the radio frequency transceiver, the filtering module, the antenna switch, the first low-noise amplification module and the second low-noise amplification module;

the antenna is connected with a signal receiving end of the radio frequency transceiver through the first low-noise amplification module, the antenna switch, the filtering module and the second low-noise amplification module in sequence, and a control end of the first low-noise amplification module and a control end of the second low-noise amplification module are respectively connected with a first end of the radio frequency transceiver;

the radio frequency transceiver controls one of the first low noise amplification module and the second low noise amplification module to be in a working state and controls the other one of the first low noise amplification module and the second low noise amplification module to be in a closed state according to the analysis condition of the received signal.

2. The radio frequency circuit of claim 1, wherein:

the first low noise amplification module includes: a first low noise amplifier and a first bypass switch in parallel with the first low noise amplifier;

the second low noise amplification module includes: a second low noise amplifier and a second bypass switch in parallel with the second low noise amplifier;

the control end of the first low-noise amplification module is the control end of the first bypass switch, and the control end of the second low-noise amplification module is the control end of the second bypass switch;

wherein, under the condition that the first bypass switch is in a conducting state, the first low-noise amplification module is in a closing state; under the condition that the first bypass switch is in an off state, the first low-noise amplification module is in a working state;

under the condition that the second bypass switch is in a conducting state, the second low-noise amplification module is in a closing state; and under the condition that the second bypass switch is in an off state, the second low-noise amplification module is in a working state.

3. The radio frequency circuit according to claim 2, wherein the first low noise amplifier module comprises at least two first low noise amplifiers connected in series, and each first low noise amplifier is connected in parallel with a first bypass switch, and the frequency levels of the different first low noise amplifiers are different;

when the working frequency of the radio frequency circuit is matched with the frequency grade of a target first low noise amplifier, the radio frequency transceiver controls a target first bypass switch to be in an off state and controls a second bypass switch to be in an on state; and controlling the target first bypass switch to be in a conducting state and controlling the second bypass switch to be in a disconnecting state under the condition that the radio frequency transceiver fails to demodulate the received signal;

the target first bypass switch is a first bypass switch connected in parallel with the target first low noise amplifier, and the first bypass switches connected in parallel with other first low noise amplifiers are in a conducting state, and the at least two first low noise amplifiers connected in series comprise the target first low noise amplifier.

4. The radio frequency circuit according to claim 3, wherein the second low noise amplification module includes at least two second low noise amplifiers connected in series, and each of the second low noise amplifiers is connected in parallel with a respective one of the second bypass switches, and the frequency levels of the different second low noise amplifiers are different;

when the working frequency of the radio frequency circuit is matched with the frequency grade of a target second low-noise amplifier, if the radio frequency transceiver fails to demodulate the received signal after the first low-noise amplification processing, the radio frequency transceiver controls the first bypass switch to be in a conducting state and controls the target second bypass switch to be in a disconnecting state;

the target second bypass switch is a second bypass switch connected in parallel with the target second low noise amplifier, and the second bypass switches connected in parallel with other second low noise amplifiers are in a conducting state, and the at least two second low noise amplifiers connected in series comprise the target second low noise amplifier.

5. The RF circuit of claim 1, wherein the filtering module comprises N filters, and different filters correspond to different operating frequency bands, the antenna switch is a single-pole N-throw switch, and N is an integer greater than 1;

the output end of the first low-noise amplification module is connected with the first end of the single-pole N-throw switch, the N second ends of the single-pole N-throw switch are respectively connected with the input ends of the N filters, and the output ends of the N filters are respectively connected with the input end of the second low-noise amplification module.

6. The RF circuit of claim 5, wherein the second low noise amplification module comprises M second low noise amplifiers, M second bypass switches, and M switches, M being an integer greater than 1;

the M second bypass switches are respectively connected with the M second low-noise amplifiers in parallel, and the control end of the second low-noise amplification module comprises the control ends of the M second bypass switches;

the input ends of the M second low-noise amplifiers are correspondingly connected with the output ends of the N filters through the M selector switches respectively;

the control ends of the M change-over switches are respectively connected with the radio frequency transceiver;

under the condition that the second low-noise amplification module is in a working state, the target filter is connected with the radio frequency transceiver through the target selector switch and the target second low-noise amplifier;

under the condition that the second low-noise amplification module is in a closed state, a target filter is connected with the radio frequency transceiver;

the target filter and the target second low-noise amplifier are respectively matched with the working frequency of the radio-frequency circuit, the target second bypass switch is connected with the target second low-noise amplifier in parallel, and the target change-over switch is connected between the target second low-noise amplifier and the target filter.

7. An electronic device, characterized in that the electronic device comprises a radio frequency circuit according to any of claims 1-6.

8. A signal processing method applied to the electronic device according to claim 7, the method comprising:

performing first low-noise amplification processing on a radio-frequency signal received by an antenna by using a first low-noise amplifier, filtering the radio-frequency signal subjected to the first low-noise amplification processing, and performing first demodulation processing on the radio-frequency signal subjected to the filtering processing;

under the condition that the first demodulation processing does not meet the preset condition, response processing is carried out on the radio-frequency signal after the first demodulation processing;

and under the condition that the first demodulation processing meets the preset condition, closing the first low-noise amplifier, and performing second low-noise amplification processing on the radio-frequency signal after the filtering processing by adopting a second low-noise amplifier, wherein the first demodulation processing meets the preset condition and indicates that the demodulation fails.

9. The method of claim 8, wherein after the second low noise amplification process is performed on the filtered rf signal by using a second low noise amplifier, the method further comprises:

performing second demodulation processing on the radio frequency signal subjected to the second low-noise amplification processing;

under the condition that the second demodulation processing meets the preset condition, starting the first low noise amplifier, and closing the second low noise amplifier, so as to perform the first low noise amplification processing on the radio frequency signal by adopting the first low noise amplifier before the filtering processing;

and under the condition that the second demodulation processing does not meet the preset condition, performing response processing on the radio-frequency signal subjected to the second demodulation processing.

10. The method according to claim 9, wherein in a case where at least one of the first demodulation process and the second demodulation process does not satisfy a preset condition, the method further comprises:

detecting an error rate of a demodulated signal corresponding to the radio frequency signal;

and when the error rate is larger than or equal to a preset value, neglecting the radio frequency signal, starting the first low noise amplifier, and closing the two low noise amplifiers.

11. The method of claim 8, wherein in the case that the number of the first low noise amplifiers is at least two, performing a first low noise amplification process on the radio frequency signal received by the antenna by using the first low noise amplifiers comprises:

performing first low-noise amplification processing on a radio-frequency signal received by an antenna by using a target first low-noise amplifier matched with a target frequency band, wherein the target frequency band is the frequency band of the radio-frequency signal received by the antenna, and the at least two first low-noise amplifiers comprise the target first low-noise amplifier;

and/or the presence of a gas in the gas,

under the condition that the number of the second low noise amplifiers is at least two, performing second low noise amplification processing on the radio frequency signal after the filtering processing by adopting the second low noise amplifiers, including:

and performing second low-noise amplification processing on the radio-frequency signal received by the antenna by adopting a target second low-noise amplifier matched with a target frequency band, wherein the at least two second low-noise amplifiers comprise the target second low-noise amplifier.

12. An electronic device comprising a processor, a memory and a program or instructions stored on the memory and executable on the processor, which when executed by the processor, implement the steps of the signal processing method according to any one of claims 8-11.

13. A readable storage medium, characterized in that the readable storage medium stores thereon a program or instructions which, when executed by a processor, implement the steps of the signal processing method according to any one of claims 8-11.

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