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CN119921732A - Tuning circuit, tuning method, tuning chip and electronic equipment - Google Patents

Tuning circuit, tuning method, tuning chip and electronic equipment Download PDF

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Publication number
CN119921732A
CN119921732A CN202311434986.9A CN202311434986A CN119921732A CN 119921732 A CN119921732 A CN 119921732A CN 202311434986 A CN202311434986 A CN 202311434986A CN 119921732 A CN119921732 A CN 119921732A
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CN
China
Prior art keywords
switch
impedance
tuning
coupled
circuit
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Pending
Application number
CN202311434986.9A
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Chinese (zh)
Inventor
王竣
吕清
袁茂盛
齐家红
史坡
徐伟
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to CN202311434986.9A priority Critical patent/CN119921732A/en
Priority to PCT/CN2024/102127 priority patent/WO2025091980A1/en
Publication of CN119921732A publication Critical patent/CN119921732A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J3/00—Continuous tuning
    • H03J3/20—Continuous tuning of single resonant circuit by varying inductance only or capacitance only
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
    • H03K19/0175—Coupling arrangements; Interface arrangements

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  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Physics & Mathematics (AREA)
  • Computing Systems (AREA)
  • General Engineering & Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)

Abstract

The application provides a tuning circuit, a tuning method, a tuning chip and electronic equipment, which are applied to the technical field of integrated circuits and are used for solving the problems of high cost and large area of an antenna tuning and calibrating circuit. The tuning circuit includes an input port, an output port, a first switch, a second switch, and an impedance adjusting circuit. Wherein the input port is coupled to the output port through a first switch. The first end of the impedance adjusting circuit is coupled with the input port through the second switch. The second end of the impedance adjusting circuit is grounded, and the impedance adjusting circuit comprises a third switch and a first impedance element which are connected in parallel between the first end and the second end of the impedance adjusting circuit. When a load connected to the output port needs to be tuned, the first switch may be closed and the switch combination state of the second switch and the third switch may be adjusted. When impedance calibration is required for an input circuit connected to the input port, the first switch may be turned off and the switch combination state of the second switch and the third switch may be adjusted.

Description

Tuning circuit, tuning method, tuning chip and electronic equipment
Technical Field
The present application relates to the field of integrated circuits, and in particular, to a tuning circuit, a tuning method, a tuning chip, and an electronic device.
Background
When an object approaches or moves away from a terminal device provided with an antenna, the impedance of the antenna may change. By detecting the impedance change in real time, the impedance of a tuning load (such as an antenna) and a circuit transmission line maintain a conjugate matching state, so that the output of the antenna obtains the maximum transmission power, and the air (OTA) performance of the antenna is improved. In order to tune the load impedance, a corresponding tuning circuit is generally provided, and the tuning circuit is controlled to tune by a signal detected by the detection circuit. The result of the impedance detection is subject to errors due to device consistency and routing, thereby reducing the gain of antenna tuning. In order to make the impedance detection result more accurate, thereby improving the tuning gain of the antenna, a calibration circuit is generally required to calibrate the hardware circuit. But increases the cost and wiring area in the manner described above. Accordingly, there is a need to provide a solution to the above-mentioned problems.
Disclosure of Invention
The embodiment of the application provides a tuning circuit, a tuning method, a tuning chip and electronic equipment, which are used for solving the problems of high cost and large wiring area caused by the existing tuning circuit and calibration circuit.
In order to solve the above problems, the present application provides the following embodiments:
in a first aspect, a tuning circuit is provided that includes an input port, an output port, a first switch, a second switch, and an impedance adjusting circuit. Wherein the first end of the first switch is coupled to the input port. The second end of the first switch is coupled with the output port. The first end of the second switch is coupled with the input port. The second end of the second switch is coupled with the first end of the impedance adjusting circuit. The second end of the impedance adjusting circuit is grounded, and the impedance adjusting circuit comprises a third switch and a first impedance element which are connected in parallel between the first end and the second end of the impedance adjusting circuit. With the tuning circuit described above, when it is necessary to tune a load connected to an output port, the first switch can be closed, and the impedance of the load (e.g., an antenna) connected to the output port can be tuned by the plurality of switch combination states of the second switch and the third switch. When it is desired to perform impedance calibration on an input circuit connected to the input port, the first switch may be turned off, and then the input circuit connected to the input port may be impedance calibrated by a plurality of switch combination states of the second switch and the third switch. Based on the method, the tuning of the load impedance and the impedance calibration of the input circuit can be realized by only setting one tuning circuit, and an additional calibration circuit is not needed, so that the convenience of the tuning of the load impedance and the calibration of the input circuit is improved while the cost and the wiring area are reduced.
In some embodiments, the impedance adjusting circuit further comprises a fourth switch and a second impedance element connected in parallel. After the third switch and the first impedance element are connected in parallel, the third switch and the first impedance element are grounded through a fourth switch and a second impedance element which are connected in parallel. In the above way, when the antenna impedance is tuned or the input circuit is subjected to impedance calibration, multiple impedances can be provided through multiple switch combination states of the third switch and the fourth switch, so that more impedance tuning requirements are provided.
In some embodiments, the impedance adjusting circuit further comprises a fifth switch, a sixth switch, a third impedance element, and a fourth impedance element. After the third switch and the first impedance element are connected in parallel, the third switch and the third impedance element are grounded through a fifth switch and the third impedance element which are connected in series. Meanwhile, after the third switch and the first impedance element are connected in parallel, the third switch and the first impedance element are grounded through a sixth switch and a fourth impedance element which are connected in series. In the above way, when the load impedance is tuned or the impedance of the input circuit is calibrated, multiple impedances can be provided by multiple switch combination states of the third switch, the fifth switch and the sixth switch, so that more impedance tuning requirements are further provided.
In some embodiments, the tuning circuit further comprises a first tunable capacitor. The first end of the first adjustable capacitor is coupled with the second end of the first switch, and the second end of the first adjustable capacitor is coupled with the output port. Through the mode, the load impedance can be tuned according to actual requirements by utilizing the first adjustable capacitor, so that more impedance tuning requirements are met.
In some embodiments, the tuning circuit further comprises a second tunable capacitor in parallel with the first tunable capacitor. The first adjustable capacitor and the second adjustable capacitor are connected in parallel for tuning, so that more impedance tuning requirements can be met.
In some embodiments, the tuning circuit further comprises seven switches and a first connection port. Wherein the first end of the seventh switch is coupled to the input port. The second end of the seventh switch is coupled with the first connection port. The first connection port is used for connecting with the fifth impedance element. In this way, when tuning the load impedance, additional impedance elements can be provided at the input port, thereby providing more impedance tuning requirements.
In some embodiments, the tuning circuit further includes an eighth switch and a second connection port. Wherein the first end of the eighth switch is coupled to the input port. The second end of the eight switches is coupled with the second connection port. The second connection port is used for connecting with a sixth impedance element. Through the mode, the impedance element arranged at the input port can be expanded according to actual demands, and a user can conveniently adjust the impedance element according to the actual demands.
In some embodiments, the tuning circuit further includes a ninth switch and a third connection port. Wherein the first end of the ninth switch is coupled to the output port. The second end of the ninth switch is coupled to the third connection port. The third connection port is used for connecting with a seventh impedance element. In the above way, an additional impedance element can be arranged at the output port, so that more impedance tuning requirements can be met.
In some embodiments, the tuning circuit further includes a tenth switch and a fourth connection port. Wherein the first end of the tenth switch is coupled to the output port. The second end of the tenth switch is coupled with the fourth connection port. The fourth connection port is used for connecting with an eighth impedance element. Through the mode, the impedance element arranged at the output port can be expanded according to actual demands, and a user can conveniently adjust the impedance element according to the actual demands.
In some embodiments, the tuning circuit further comprises an eleventh switch and a twelfth switch. Wherein the first end of the eleventh switch is coupled to the first end of the impedance adjusting circuit. The second terminal of the eleventh switch and the first terminal of the twelfth switch are both coupled to the second terminal of the first tunable capacitor. The second terminal of the twelfth switch is coupled to the output port. In this way, if the impedance calibration needs to be performed on the circuit before the first switch, the first switch can be turned off, and multiple impedances can be provided by the second switch and multiple switch combination states of the switches in the impedance adjusting circuit. If impedance calibration of the circuit prior to the twelfth switch is required, the twelfth switch may be turned off, providing multiple impedances through multiple switch combination states of the eleventh switch and the switches in the impedance adjusting circuit. If tuning of the antenna is required, the first switch and the twelfth switch may be closed, providing multiple impedance tuning requirements through multiple switch combination states of the eleventh switch and the switch in the impedance adjusting circuit, or through multiple switch combination states of the second switch and the switch in the impedance adjusting circuit.
In some embodiments, the eleventh switch and the second switch are the same single pole, multi-throw switch. Wherein the first end of the eleventh switch and the second end of the second switch are common ends of the single pole, multi throw switch. The second end of the eleventh switch is the first contact of the single pole, multi-throw switch. The first end of the second switch is a second contact of the single pole, multi-throw switch. By the mode, the number of the switches can be reduced, and the cost and the wiring area are reduced.
In a second aspect, a tuning method is provided. The tuning method is applied to a tuning circuit, and the tuning circuit comprises an input port, an output port, a first switch, a second switch and an impedance adjusting circuit. The first end of the first switch is coupled to the input port. The second end of the first switch is coupled with the output port. The first end of the second switch is coupled with the input port. The second end of the second switch is coupled with the first end of the impedance adjusting circuit. The second end of the impedance adjusting circuit is grounded, and the impedance adjusting circuit comprises a third switch and a first impedance element which are connected in parallel between the first end and the second end of the impedance adjusting circuit. The circuit tuning method may be performed by closing the first switch. The load connected to the output port is then tuned by the multiple switch combination states of the second switch and the third switch.
In some embodiments, the circuit tuning method described above may also open the first switch when performed. Then, an input circuit connected to the input port is impedance-calibrated by a plurality of switch combination states of the second switch and the third switch.
In a third aspect, a tuning chip is provided. The tuning chip comprises a backing plate and a tuning circuit in any of the embodiments of the first aspect described above disposed on the backing plate.
In a fourth aspect, an electronic device is provided. The electronic device comprises a radio frequency integrated circuit, a bi-directional coupler, an antenna and the tuning chip of the second aspect. The radio frequency integrated circuit comprises an output terminal and a measuring terminal. The input end of the bidirectional coupler is coupled with the output end of the radio frequency integrated circuit. The input port of the tuning chip is coupled to the output of the bi-directional coupler. The output port of the tuning chip is coupled to the antenna. The coupling end of the bidirectional coupler is coupled with the measuring end of the radio frequency integrated circuit.
Technical effects of the second to fourth aspects and possible embodiments described above may be referred to the description of technical effects of the first aspect and possible embodiments described above, and will not be repeated here.
Drawings
Fig. 1 is a schematic diagram of an antenna tuning and calibration circuit;
FIG. 2 is a schematic diagram of another circuit configuration for tuning and calibration of an antenna;
FIG. 3 is a schematic diagram of a bi-directional coupler according to an embodiment of the present application;
Fig. 4 is a block diagram of a tuning circuit according to an embodiment of the present application;
FIG. 5 is a block diagram of another tuning circuit according to an embodiment of the present application;
FIG. 6 is a block diagram of yet another tuning circuit provided in an embodiment of the present application;
FIG. 7 is a block diagram of yet another tuning circuit provided in an embodiment of the present application;
FIG. 8 is a block diagram of yet another tuning circuit provided in an embodiment of the present application;
fig. 9 is a block diagram of a tuning circuit according to another embodiment of the present application;
fig. 10 is a schematic flow chart of a tuning method according to an embodiment of the present application;
Fig. 11 is a schematic structural diagram of a tuning chip according to an embodiment of the present application;
fig. 12 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application.
In order to clearly describe the technical solution of the embodiments of the present application, in the embodiments of the present application, the words "first", "second", etc. are used to distinguish the same item or similar items having substantially the same function and effect. It will be appreciated by those of skill in the art that the words "first," "second," and the like do not limit the amount and order of execution, and that the words "first," "second," and the like do not necessarily differ. Meanwhile, in the embodiments of the present application, words such as "exemplary" or "such as" are used to mean serving as examples, illustrations or explanations. Any embodiment or design described herein as "exemplary" or "e.g." in an embodiment should not be taken as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion that may be readily understood.
In describing some embodiments, expressions of "coupled" and "connected" and their derivatives may be used. For example, the term "connected" may be used in describing some embodiments to indicate that two or more elements are in direct physical or point contact with each other. As another example, the term "coupled" may be used in describing some embodiments to indicate that two or more elements are in direct physical or electrical contact, or to indicate that two or more elements are not in direct contact with each other, but yet still co-operate or interact with each other. The embodiments disclosed herein are not necessarily limited to the disclosure herein.
The application is described in detail below with reference to the attached drawings and examples:
Closed loop tuning of an antenna is primarily dependent on impedance detection. Where impedance is a physical quantity representing the performance of an element or a segment of the electrical performance of a circuit, is the impediment to current flow in a circuit having resistance, inductance, and capacitance. The impedance is commonly denoted as Z, being a complex number, the real part being a resistance and the imaginary part being called a reactance. When an object approaches or moves away from an electronic device provided with an antenna, the impedance of the antenna may change. By detecting the impedance change of the antenna in real time, the impedance of the tuned antenna and the circuit transmission line maintain a conjugate matching state, so that the output of the antenna can obtain the maximum transmission power. As shown in fig. 1, in order to implement impedance detection and impedance tuning of an antenna, the electronic device 100 generally includes a radio frequency integrated circuit 110 (INTEGRATED CIRCUIT, IC), a power amplifier 120 (PA), a bi-directional coupler 130, an attenuator 140, a tuning circuit 150, a calibration circuit 160, and an antenna 170. The rf output Tx of the rf integrated circuit 110 is coupled to the input a of the bi-directional coupler 130 through the power amplifier 120. The output b of the bi-directional coupler 130 is coupled to an antenna 170 via a tuning circuit 150 and a calibration circuit 160. In addition, the coupling terminals (including the forward coupling terminal Fwr and the reverse coupling terminal Rev) of the bidirectional coupler 130 are coupled to the input terminal of the attenuator 140 through the gating switch SW. The output of the attenuator 140 is coupled to the measurement terminal MRx of the radio frequency integrated circuit 110. The rf signal is first amplified by the power amplifier 120 after being output through the rf output terminal Tx of the rf integrated circuit 110. And then sequentially passes through the bi-directional coupler 130, the tuning circuit 150 and the calibration circuit 160 to be output through the antenna 170. Meanwhile, the forward transmission signal detected by the forward coupling terminal Fwr of the bi-directional coupler 130 or the reverse transmission signal detected by the reverse coupling terminal Rev may be processed by the attenuator 140 and then transmitted to the measurement terminal MRx of the radio frequency integrated circuit 110. The rf integrated circuit 110 may calculate the reflection coefficient (i.e. the value of the reverse transmission signal/the forward transmission signal) of the measurement end MRx according to the forward transmission signal and the reverse transmission signal. Finally, the reflection coefficient of the antenna 170 is calculated according to the reflection coefficient of the measurement end MRx, so that the impedance state of the antenna 170 is obtained, and the tuning circuit 150 is controlled according to the impedance state, so that the impedance of the antenna 170 is tuned.
In the above implementation, the principle of the bi-directional coupler 130 is shown in fig. 3. When the bi-directional coupler 130 is used, the reflection coefficient f in of the antenna can be calculated by measuring the reflection coefficient f MRx of the end MRx, the coupling coefficient of the bi-directional coupler 130 (including the forward coupling coefficient S 31 and the reverse coupling coefficient S 42), the isolation between the input end a and the reverse coupling end Rev of the bi-directional coupler 130S 41, the isolation between the output end b and the forward coupling end Fwr of the bi-directional coupler 130S 32, and the through-channel insertion loss of the bi-directional coupler 130S 21. The impedance state of the antenna is obtained by the reflection coefficient r in, so that the impedance of the tuning circuit 150 is tuned according to the impedance state. The specific calculation formula (1) is as follows:
where a=s 41/S31,b＝S21·S42/S31,c＝S21·S32/S31, and a, b, and c represent calculation parameters.
However, due to the influence of the consistency of the impedance of the device and the single board wiring, the impedance parameter of the circuit fluctuates, so that the impedance detection result has errors, and the tuning gain of the antenna is lost, even negative gain is caused. Therefore, the circuit needs to be impedance calibrated by the calibration circuit 160. The impedance calibration process is inverse operation of impedance detection. In case the reflection coefficient f in of the antenna and the reflection coefficient f MRx of the measurement end MRx are known, the S parameters of the bi-directional coupler (including S 21、S31、S32、S41 and S 42) are back-deduced, i.e. the three parameters a, b and c are solved in the calibration process. In performing impedance calibration, at least three types of impedance states need to be provided by the calibration circuit 160 to solve for the three parameters a, b and c. As shown in fig. 1, many calibration circuits 160 are provided separately from the tuning circuit 150 in the electronic device for impedance calibration of the circuit. Alternatively, as shown in FIG. 2, the calibration circuit 160 is an external circuit. A probing point is provided between the tuning circuit 150 and the antenna 170, and the calibration circuit 160 is connected to the probing point a via a probe. In this way, the calibration circuit 160 can be independently set, and various calibration requirements can be better satisfied. Both of the above require additional calibration circuitry 160, which increases cost and routing area.
In order to solve the above-described problems, as shown in fig. 4, an embodiment of the present application provides a tuning circuit 400. The tuning circuit 400 includes an input port RFin, an output port RFout, a first switch S1, a second switch S2, and an impedance adjusting circuit 410. The first end of the first switch S1 is coupled to the input port RFin, and the second end of the first switch S1 is coupled to the output port RFout. The first end of the second switch S2 is coupled to the input port RFin. A second terminal of the second switch S2 is coupled to a first terminal of the impedance adjusting circuit 410. The second terminal of the impedance adjusting circuit 410 is grounded, and the impedance adjusting circuit 410 includes a third switch S3 and a first impedance element Z1 connected in parallel between the first terminal and the second terminal of the impedance adjusting circuit 410. The first impedance element Z1 may be an element with stable impedance characteristics, and the impedance value of the first impedance element Z1 may be selected according to actual requirements, which is not particularly limited in the embodiment of the present application.
In one example, when impedance calibration of an input circuit connected to the input port RFin is desired, the first switch S1 may be opened and then the input circuit connected to the input port RFin may be impedance calibrated through the multiple switch combination states of the second switch S2 and the third switch S3. Wherein, when the first switch S1 is turned off, the switch combination states of the second switch S2 and the third switch S3 are as follows:
1) The second switch S2 is opened. The impedance adjusting circuit 410 provides only an open circuit impedance at this time.
2) The second switch S2 is closed and the third switch S3 is opened. At this time, the impedance adjusting circuit 410 provides an impedance Z 1+Zs2. Wherein Z s2 is the impedance of the second switch S2, and Z 1 is the impedance of the first impedance element Z1.
3) The second switch S2 and the third switch S3 are closed. At this point, the impedance provided by the impedance adjusting circuit 410 is Z s2+Z1*Zs3/(Z1+Zs3). Wherein Z s3 is the impedance of the third switch S3.
When impedance calibration is performed, the reflection coefficient f in of the antenna and the reflection coefficient f MRx of the measurement end can be set to known values. Through the three impedance states and the calculation formula (1), three calculation formulas can be constructed, and three parameters a, b and c are solved, so that impedance calibration of an input circuit connected with an input port RFin is realized.
In one example, after impedance calibration of an input circuit connected to the input port RFin, if a load connected to the output port RFout is desired to be tuned, the first switch S1 may be closed and the load connected to the output port RFout may be tuned by a plurality of switch combination states of the second switch S2 and the third switch S3. For example, when the first switch S1 is closed, the second switch S2 may be opened first. The corresponding reflection coefficient (i.e., the value of the reverse transmission signal/forward transmission signal) is calculated by the forward transmission signal detected by the forward coupling terminal Fwr and the reverse transmission signal detected by the reverse coupling terminal Rev of the bi-directional coupler. Then, the switch combination state of the second switch S2 and the third switch S3 is confirmed based on the reflection coefficient. When the first switch S1 is turned on, the switch combination states of the second switch S2 and the third switch S3 may refer to the switch combination states when the impedance calibration is performed on the input circuit, which is not described herein. In addition, the switch combination state of the second switch S2 and the third switch S3 may be selected according to the impedance state of the antenna. For example, the radio frequency IC may determine the switch combination state of the second switch S2 and the third switch S3 by means of a look-up table. Illustratively, the operator may construct a look-up table based on the tuning relationship between the reflection coefficient f MRx at the measurement end and the switch combination states of the second switch S2 and the third switch S3. Then, the radio frequency IC determines the switch combination state of the second switch S2 and the third switch S3 from the lookup table according to the reflection coefficient f MRx detected in real time, and controls the switch states of the second switch S2 and the third switch S3 according to the switch combination state, so as to realize the impedance tuning of the antenna.
By the above mode, only one tuning circuit 400 is needed to realize the tuning of the impedance of a load (such as an antenna) and the calibration of an input circuit, and an additional calibration circuit is not needed, so that the cost and the wiring area are reduced, and the convenience of antenna tuning and input circuit calibration is improved.
In some embodiments, as shown in fig. 5, the impedance adjusting circuit 410 further includes a fourth switch S4 and a second impedance element Z2 connected in parallel. After the third switch S3 and the first impedance element Z1 are connected in parallel, they are grounded through the fourth switch S4 and the second impedance element Z2 connected in parallel. In the above manner, when the impedance calibration is required for the input circuit connected to the input port RFin, the first switch S1 may be turned off, and then the impedance calibration is performed for the input circuit connected to the input port RFin through the plurality of switch combination states of the second switch S2, the third switch S3 and the fourth switch S4. Wherein, when the first switch S1 is turned off, the switch combination states of the second switch S2, the third switch S3 and the fourth switch S4 are as follows:
1) The second switch S2 is opened. The impedance adjusting circuit 410 provides only an open circuit impedance at this time.
2) The second switch S2 is closed and the third switch S3 and the fourth switch S4 are opened. At this time, the impedance adjusting circuit 410 provides an impedance Z 1+Zs2+Z2. Wherein Z s2 is the impedance of the second switch S2, Z 1 is the impedance of the first impedance element Z1, and Z 2 is the impedance of the second impedance element Z2.
3) The second switch S2 and the third switch S3 are closed, and the fourth switch S4 is opened. At this point, the impedance provided by the impedance adjusting circuit 410 is Z 2+Zs2+Z1*Zs3/(Z1+Zs3). Wherein Z s3 is the impedance of the third switch S3.
4) The second switch S2 and the fourth switch S4 are closed, and the third switch S3 is opened. At this point, the impedance provided by the impedance adjusting circuit 410 is Z 1+Zs2+Z2*Zs4/(Z2+Zs4). Wherein Z s4 is the impedance of the fourth switch S4.
5) The second switch S2, the third switch S3 and the fourth switch S4 are closed. At this time, the impedance provided by the impedance adjusting circuit 410 is Zs2+Z1*Zs3/(Z1+Zs3)+Z2*Zs4/(Z2+Zs4).
When impedance calibration is performed, the reflection coefficient f in of the antenna and the reflection coefficient f MRx of the measurement end can be set to known values. Three calculation equations can be constructed through any three of the five impedance states and the calculation equation (1), and three parameters a, b and c are solved, so that impedance calibration of an input circuit connected with the input port RFin is realized.
After impedance calibration of the input circuit connected to the input port RFin, if the load connected to the output port RFout needs to be tuned, the first switch S1 may be closed and the load connected to the output port RFout may be tuned by a plurality of switch combination states of the second switch S2, the third switch S3 and the fourth switch S4. For example, when the first switch S1 is closed, the second switch S2 may be opened first. The corresponding reflection coefficient (i.e., the value of the reverse transmission signal/forward transmission signal) is calculated by the forward transmission signal detected by the forward coupling terminal Fwr and the reverse transmission signal detected by the reverse coupling terminal Rev of the bi-directional coupler. Then, the switch combination states of the second switch S2, the third switch S3, and the fourth switch S4 are confirmed based on the reflection coefficient. When the first switch S1 is closed, the switch combination states of the second switch S2, the third switch S3 and the fourth switch S4 are the same as those of performing impedance calibration on the input circuit connected to the input port RFin, and the embodiments of the application are not described herein.
In the foregoing embodiment, the impedance adjusting circuit 410 in fig. 5 is only an example provided by the embodiment of the present application, and the embodiment of the present application is not described herein in detail, and may be further expanded by referring to the parallel connection manner of the fourth switch S4 and the second impedance element Z2.
In some embodiments, based on the tuning circuit 400 of fig. 5, as shown in fig. 6, the tuning circuit 400 further includes a first tunable capacitor C1. The first end of the first adjustable capacitor C1 is coupled to the second end of the first switch S1. The second terminal of the first tunable capacitor C1 is coupled to the output port RFout. When impedance tuning of a load (e.g., an antenna) is desired, in addition to tuning by the impedance adjusting circuit 410 described above, impedance tuning of the load may also be achieved by adjusting the first tunable capacitance C1.
Optionally, the tuning circuit 400 further includes a second tunable capacitor C2 connected in parallel with the first tunable capacitor C1. The first adjustable capacitor C1 and the second adjustable capacitor C2 can form a parallel tuning circuit so as to meet more tuning requirements.
In some embodiments, as shown in fig. 7, the tuning circuit 400 may further include a seventh switch S7 and a first connection port P1. Wherein a first end of the seventh switch S7 is coupled to the input port RFin. The second terminal of the seventh switch S7 is coupled to the first connection port P1. The first connection port P1 is used for connecting a fifth impedance element. The fifth impedance element may be a resistor, a capacitor, an inductor, etc., and may be specifically selected according to the use requirement of the user. In this way, when impedance tuning the load, additional impedance elements may be provided at the input port RFin, thereby providing more impedance tuning requirements.
Furthermore, the impedance element connected with the input port RFin can be expanded. For example, as shown in fig. 7, the tuning circuit 400 may further include an eighth switch S8 and a second connection port P2. Wherein a first end of the eighth switch S8 is coupled to the input port RFin. A second terminal of the eighth switch S8 is coupled to the second connection port P2. The second connection port P2 is used to connect a sixth impedance element. The sixth impedance element may be a resistor, a capacitor, an inductor, etc., and may be selected according to a user's use requirement when in specific use. In addition, the fifth impedance element and the sixth impedance element may be the same or different, and the embodiment of the present application is not particularly limited thereto.
The above-described embodiment is only an example given by way of example of the application, and the impedance element to which the input port RFin is connected can also be extended in a similar manner.
In some embodiments, as shown in fig. 7, the tuning circuit 400 may further include a ninth switch S9 and a third connection port P3. A first end of the ninth switch S9 is coupled to the output port RFout. A second terminal of the ninth switch S9 is coupled to the third connection port P3. The third connection port P3 is for connecting a seventh impedance element. In this way, when impedance tuning the load, an additional impedance element may be provided at the output port RFout, thereby providing more impedance tuning requirements.
Further, the impedance element to which the output port RFout is connected can also be expanded. For example, as shown in fig. 7, the tuning circuit 400 may further include a tenth switch S10 and a fourth connection port P4. A first end of the tenth switch S10 is coupled to the output port RFout. The second terminal of the tenth switch S10 is coupled to the fourth connection port P4. The fourth connection port P4 is for connecting an eighth impedance element. In the above implementation, the seventh impedance element and the eighth impedance element may be the same or different. In addition, the fifth impedance element to the eighth impedance element may be selected according to actual requirements, which is not particularly limited in the embodiment of the present application.
Of course, the above embodiment is also only an example given by way of example of the application, and the impedance element to which the output port RFout is connected can also be extended in a similar manner.
In some embodiments, as shown in fig. 8, the tuning circuit 400 may further include an eleventh switch S11 and a twelfth switch S12. Wherein a first terminal of the eleventh switch S11 is coupled to a first terminal of the impedance adjusting circuit 410. The second terminal of the eleventh switch S11 and the first terminal of the twelfth switch S12 are both coupled to the second terminal of the first tunable capacitor C1. A second terminal of the twelfth switch S12 is coupled to the output port RFout. In this way, if the circuit before the first switch S1 needs to be impedance calibrated, the first switch S1 may be turned off, and multiple impedances are provided by multiple switch combination states of the second switch S2 and the switch in the impedance adjusting circuit 410, so that the circuit before the first switch S1 is impedance calibrated according to the detected reflection coefficient. If it is necessary to perform impedance calibration on the circuit before the twelfth switch S12, the twelfth switch S12 may be turned off, and various impedances may be provided by various switch combination states of the switch in the eleventh switch S11 and the impedance adjusting circuit 410, so that the circuit before the twelfth switch S12 is subjected to impedance calibration according to the detected reflection coefficient. If tuning of the antenna is required, the first switch S1 and the twelfth switch S12 may be closed, multiple impedances may be provided by multiple switch combination states of the switch in the eleventh switch S11 and the impedance adjusting circuit 410, or multiple impedances may be provided by multiple switch combination states of the switch in the second switch S2 and the impedance adjusting circuit 410, thereby satisfying more impedance tuning requirements. The switch combination states of the eleventh switch S11 and the switch in the impedance adjusting circuit 410, or the switch combination states of the second switch S2 and the switch in the impedance adjusting circuit 410 may be combined in a similar manner as described above with reference to fig. 4 or fig. 5, which is not described herein.
Further, to reduce the use of components, and reduce the cost and wiring area, the eleventh switch S11 and the second switch S2 may be the same single pole multiple throw switch. The single pole, multi-throw switch includes a common terminal and a plurality of switchable contacts. Wherein the first end of the eleventh switch S11 and the second end of the second switch S2 are common ends of the single pole multiple throw switch. The second end of the eleventh switch S11 is the first contact of the single pole, multi-throw switch. The first end of the second switch S2 is the second contact of the single pole, multi-throw switch. The first contact and the second contact can be any two different contacts in the single-pole multi-throw switch. For example, in order to improve the utilization rate of the switch, the single-pole multi-throw switch may be a single-pole double-throw switch.
In an example, the branch where the second adjustable capacitor C2 in the foregoing embodiments is located may further be provided with a switch S0, so that whether to switch in the second adjustable capacitor C2 may be selected according to actual needs during tuning.
In the implementation process, the embodiment in fig. 8 is only an example provided by the embodiment of the present application, and any one of the embodiments in fig. 4 to fig. 7 may optionally set the eleventh switch S11 and the twelfth switch S12 in the manner in fig. 8, which is not described herein. In addition, the above embodiments may be combined and expanded, and the embodiment of the present application is not particularly limited thereto.
In some embodiments, as shown in fig. 9, the tuning circuit 400 may further include a fifth switch S5, a sixth switch S6, a third impedance element Z3, and a fourth impedance element Z4. After the third switch S3 and the first impedance element Z1 are connected in parallel, the third switch S3 and the third impedance element Z3 are grounded through a fifth switch S5 and a third switch Z3 connected in series. Meanwhile, after the third switch S3 and the first impedance element Z1 are connected in parallel, they are grounded through the sixth switch S6 and the fourth impedance element Z4 connected in series.
In the above manner, when impedance calibration is required for the input circuit connected to the input port RFin, the first switch S1 may be turned off, and then impedance calibration is performed for the input circuit connected to the input port RFin through the multiple switch combination states of the second switch S2, the third switch S3, the fifth switch S5 and the sixth switch S6. Wherein, when the first switch S1 is turned off, the switch combination states of the second switch S2, the third switch S3, the fifth switch S5 and the sixth switch S6 are as follows:
1) The second switch S2 is opened. The impedance adjusting circuit 410 provides only an open circuit impedance at this time.
2) The second switch S2 is closed, the third switch S3 and the sixth switch S6 are opened, and the fifth switch S5 is closed. At this time, the impedance adjusting circuit 410 provides an impedance Z 1+Zs2+Zs5+Z3. Wherein Z s2 is the impedance of the second switch S2, Z 1 is the impedance of the first impedance element Z1, Z 3 is the impedance of the third impedance element Z3, and Z s5 is the impedance of the fifth switch S5.
3) The second switch S2 is closed, the third switch S3 and the fifth switch S5 are opened, and the sixth switch S6 is closed. At this time, the impedance adjusting circuit 410 provides an impedance Z 1+Zs2+Zs6+Z4. Wherein Z 4 is the impedance of the fourth impedance element Z4, and Z s6 is the impedance of the sixth switch S6.
4) The second switch S2 is closed, the third switch S3 is opened, and the fifth switch S5 and the sixth switch S6 are closed. At this time, the impedance provided by the impedance adjusting circuit 410 is Z1+Zs2+(Zs5+Z3)*(Zs6+Z4)/((Zs5+Z3)+(Zs6+Z4)).
5) The second switch S2 is closed, the third switch S3 is closed, and the fifth switch S5 and the sixth switch S6 are closed. At this time, the impedance provided by the impedance adjusting circuit 410 is Zs2+Z1*Zs3/(Z1+Zs3)+(Zs5+Z3)*(Zs6+Z4)/((Zs5+Z3)+(Zs6+Z4)).
6) The second switch S2 is closed, the third switch S3 is closed, the fifth switch S5 is closed, and the sixth switch S6 is opened. At this time, the impedance adjusting circuit 410 provides an impedance Z s2+Z1*Zs3/(Z1+Zs3)+Zs5+Z3.
7) The second switch S2 is closed, the third switch S3 is closed, the fifth switch S5 is closed, and the sixth switch S6 is opened. At this time, the impedance adjusting circuit 410 provides an impedance Z s2+Z1*Zs3/(Z1+Zs3)+Zs6+Z4.
When impedance calibration is performed, the reflection coefficient f in of the antenna and the reflection coefficient f MRx of the measurement end can be set to known values. Three calculation equations can be constructed through any three of the seven impedance states and the calculation equation (1), and the three parameters a, b and c are solved, so that impedance calibration of an input circuit connected with the input port RFin is realized.
After impedance calibration of the input circuit connected to the input port RFin, if the load connected to the output port RFout needs to be tuned, the first switch S1 may be closed and the load connected to the output port RFout may be tuned by a plurality of switch combination states of the second switch S2, the third switch S3, the fifth switch S5 and the sixth switch S6. For example, when the first switch S1 is closed, the second switch S2 may be opened first. The corresponding reflection coefficient (i.e., the value of the reverse transmission signal/forward transmission signal) is calculated by the forward transmission signal detected by the forward coupling terminal Fwr and the reverse transmission signal detected by the reverse coupling terminal Rev of the bi-directional coupler. Then, the switch combination states of the second switch S2, the third switch S3, the fifth switch S5, and the sixth switch S6 are confirmed based on the reflection coefficient. When the first switch S1 is closed, the switch combination states of the second switch S2, the third switch S3, the fifth switch S5 and the sixth switch S6 are the same as those of the input circuit connected to the input port RFin when impedance calibration is performed, and detailed description of the embodiment of the application is omitted herein.
Further, the tuning circuit 400 in fig. 9 may be extended or combined with any one of the embodiments in fig. 6-8, which is not limited in this embodiment of the present application.
In some embodiments, as shown in fig. 10, the embodiment of the present application further provides a tuning method applied to the tuning circuit 400. The method can be executed by a processor, and the specific execution process is as follows:
s101, opening a first switch.
The first switch S1 may be controlled by a control signal issued by a processor in the radio frequency IC, or may be controlled by a control signal issued by a processor connected to the radio frequency IC, which is not particularly limited in the embodiment of the present application. The processor may be a central processing unit (central processing unit, CPU), a general-purpose processor, a network processor (network processor, NP), a field programmable gate array (field programmable GATE ARRAY, FPGA), an application APECIFIC INTEGRATED circuit (ASIC), a system on chip (SoC), or any combination thereof. The embodiment of the present application is not particularly limited thereto.
And S102, performing impedance calibration on an input circuit connected with the input port through a plurality of switch combination states of the second switch and the third switch.
For example, when impedance calibration is performed, the processor may control the second switch S2 and the third switch S3 according to the switch combination states correspondingly described in fig. 4, so that three parameters a, b and c are solved through the three impedance states and three calculation equations constructed by the calculation formula (1), and further impedance calibration of the input circuit is achieved.
S103, closing the first switch.
After impedance calibration of the input circuit coupled to the input port RFin, the first switch S1 may be closed by the rf IC to control the switches in the tuning circuit 400 according to the reflection coefficients determined by the forward and reverse transmission signals, thereby impedance tuning the load (including but not limited to the antenna).
And S104, tuning a load connected with the output port through a plurality of switch combination states of the second switch and the third switch.
The switch combination state of the second switch S2 and the third switch S3 may also be controlled by a control signal issued by a processor in the radio frequency IC, or by a control signal issued by a processor connected to the radio frequency IC. In addition, the processor may determine the switch combination state of the second switch S2 and the third switch S3 by means of a look-up table when tuning. Illustratively, the operator may construct a look-up table based on the tuning relationship between the reflection coefficient f MRx at the measurement end and the switch combination states of the second switch S2 and the third switch S3. Then, the processor determines the switch combination state of the second switch S2 and the third switch S3 from the lookup table according to the reflection coefficient f MRx detected in real time, and controls the switch states of the second switch S2 and the third switch S3 according to the switch combination state, so that the impedance tuning of the load is realized.
In the above implementation process, each switch or adjustable capacitor in fig. 5 to 9 may also be controlled by a tuning manner set in the lookup table, which is not described herein in detail in the embodiments of the present application. Meanwhile, S101 and S102 are optional steps, which are performed only when impedance calibration is required for an input circuit connected to the input port RFin. In addition, the tuning circuit 400 may be used to perform a specific absorption rate (specific absorption rate, SAR) test instead of a SAR sensor in addition to impedance tuning of a load. Because the impedance of the antenna and the distance between the human body and the antenna have a certain mapping relation, whether the human body approaches or not can be detected through impedance change in principle, and the function of the existing SAR sensor can be replaced.
In some embodiments, as shown in fig. 11, the present embodiment also provides a tuning chip 1100, the tuning chip 1100 including a backing plate 1110 and the tuning circuit 400 described above disposed on the backing plate 1110. The board 1110 may be any of various conventional boards used in the field of manufacturing chips such as printed circuit boards (printed circuitboard, PCBs) and silicon substrates. The tuning circuit 400 may be selected from any of the above embodiments, which is not particularly limited by the embodiment of the present application.
In some implementations, as shown in fig. 12, an example of the application also provides an electronic device 1200. The electronic device 1200 includes a radio frequency integrated circuit 1210, a bi-directional coupler 1220, an antenna 1230, and a tuning chip 1100. The radio frequency integrated circuit 1210 includes an output terminal Tx and a measurement terminal MRx. The input a of the bi-directional coupler 1220 is coupled to the output Tx of the rf integrated circuit 1210 through the power amplifier 1240. The input port RFin of the tuning chip 1100 is coupled to the output b of the bi-directional coupler 1220. The output port RFout of the tuning chip 1100 is coupled to an antenna 1230. The coupling end (including the forward coupling end Fwr and the reverse coupling end Rev) of the bi-directional coupler 1220 is coupled to the measurement end MRx of the rf integrated circuit 1210 through the gating switch SW and the attenuator 1250 in sequence. The electronic device 1200 may be a bluetooth module, a cellular communication module, a mobile terminal device (such as a mobile phone, a computer, a smart band, a smart watch), a lan device, a server, or other devices that need to tune an antenna, which is not particularly limited in the embodiments of the present application.
Further, in the implementation process, the chip or the electronic device in the foregoing examples may also include other types of devices, which are not limited in particular by the embodiment of the present application.
Those of ordinary skill in the art will appreciate that the functions of the circuits of the examples described in connection with the embodiments disclosed herein can be implemented as electronic hardware, or as a combination of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the several embodiments provided by the present application, it should be understood that the disclosed circuits and electronic devices may be implemented in other ways. For example, the above-described device embodiments are merely illustrative, e.g., the division of modules is merely a logical function division, and there may be additional divisions of actual implementation, e.g., multiple modules or components may be combined or integrated into another device, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interface, indirect coupling or communication connection of devices or modules, electrical, mechanical, or other form.
In addition, the chip in the embodiments of the present application may be integrated in one device, or each module may exist alone physically, or two or more modules may be integrated in one device.
The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (15)

1.一种调谐电路，其特征在于，包括：输入端口、输出端口、第一开关、第二开关以及阻抗调节电路；1. A tuning circuit, comprising: an input port, an output port, a first switch, a second switch and an impedance adjustment circuit; 所述第一开关的第一端与所述输入端口耦接；所述第一开关的第二端与所述输出端口耦接；A first end of the first switch is coupled to the input port; a second end of the first switch is coupled to the output port; 所述第二开关的第一端与所述输入端口耦接；所述第二开关的第二端与所述阻抗调节电路的第一端耦接；A first end of the second switch is coupled to the input port; a second end of the second switch is coupled to a first end of the impedance adjustment circuit; 所述阻抗调节电路的第二端接地，且所述阻抗调节电路包括并联在所述阻抗调节电路的第一端和第二端之间的第三开关和第一阻抗元件。The second end of the impedance adjustment circuit is grounded, and the impedance adjustment circuit includes a third switch and a first impedance element connected in parallel between the first end and the second end of the impedance adjustment circuit. 2.根据权利要求1所述的调谐电路，其特征在于，所述阻抗调节电路还包括并联的第四开关和第二阻抗元件；所述第三开关和所述第一阻抗元件并联后，通过并联的所述第四开关和所述第二阻抗元件接地。2. The tuning circuit according to claim 1 is characterized in that the impedance adjustment circuit also includes a fourth switch and a second impedance element connected in parallel; after the third switch and the first impedance element are connected in parallel, they are grounded through the fourth switch and the second impedance element connected in parallel. 3.根据权利要求1所述的调谐电路，其特征在于，所述阻抗调节电路还包括第五开关、第六开关、第三阻抗元件和第四阻抗元件；其中，3. The tuning circuit according to claim 1, characterized in that the impedance adjustment circuit further comprises a fifth switch, a sixth switch, a third impedance element and a fourth impedance element; wherein, 所述第三开关和所述第一阻抗元件并联后，通过串联的所述第五开关和所述第三阻抗元件接地；同时，所述第三开关和所述第一阻抗元件并联后，还通过串联的所述第六开关和所述第四阻抗元件接地。After the third switch and the first impedance element are connected in parallel, they are grounded through the fifth switch and the third impedance element connected in series; meanwhile, after the third switch and the first impedance element are connected in parallel, they are also grounded through the sixth switch and the fourth impedance element connected in series. 4.根据权利要求1-3任一项所述的调谐电路，其特征在于，还包括：第一可调电容；其中，所述第一可调电容的第一端与所述第一开关的第二端耦接；所述第一可调电容的第二端与所述输出端口耦接。4. The tuning circuit according to any one of claims 1-3 is characterized in that it also includes: a first adjustable capacitor; wherein the first end of the first adjustable capacitor is coupled to the second end of the first switch; and the second end of the first adjustable capacitor is coupled to the output port. 5.根据权利要求4所述的调谐电路，其特征在于，还包括：与所述第一可调电容并联的第二可调电容。5 . The tuning circuit according to claim 4 , further comprising: a second adjustable capacitor connected in parallel with the first adjustable capacitor. 6.根据权利要求1-5任一项所述的调谐电路，其特征在于，还包括：第七开关和第一连接端口；所述第七开关的第一端与所述输入端口耦接；所述第七开关的第二端与所述第一连接端口耦接；所述第一连接端口用于连接第五阻抗元件。6. The tuning circuit according to any one of claims 1-5 is characterized in that it also includes: a seventh switch and a first connection port; the first end of the seventh switch is coupled to the input port; the second end of the seventh switch is coupled to the first connection port; the first connection port is used to connect a fifth impedance element. 7.根据权利要求6所述的调谐电路，其特征在于，还包括：第八开关和第二连接端口；所述第八开关的第一端与所述输入端口耦接；所述八开关的第二端与所述第二连接端口耦接；所述第二连接端口用于连接第六阻抗元件。7. The tuning circuit according to claim 6 is characterized in that it also includes: an eighth switch and a second connection port; the first end of the eighth switch is coupled to the input port; the second end of the eighth switch is coupled to the second connection port; and the second connection port is used to connect a sixth impedance element. 8.根据权利要求1-7任一项所述的调谐电路，其特征在于，还包括：第九开关和第三连接端口；所述第九开关的第一端与所述输出端口耦接；所述第九开关的第二端与所述第三连接端口耦接；所述第三连接端口用于连接第七阻抗元件。8. The tuning circuit according to any one of claims 1-7 is characterized in that it also includes: a ninth switch and a third connection port; the first end of the ninth switch is coupled to the output port; the second end of the ninth switch is coupled to the third connection port; and the third connection port is used to connect a seventh impedance element. 9.根据权利要求8所述的调谐电路，其特征在于，还包括：第十开关和第四连接端口；所述第十开关的第一端与所述输出端口耦接；所述第十开关的第二端与所述第四连接端口耦接；所述第四连接端口用于连接第八阻抗元件。9. The tuning circuit according to claim 8 is characterized in that it also includes: a tenth switch and a fourth connection port; the first end of the tenth switch is coupled to the output port; the second end of the tenth switch is coupled to the fourth connection port; and the fourth connection port is used to connect an eighth impedance element. 10.根据权利要求2-9任一项所述的调谐电路，其特征在于，还包括：第十一开关和第十二开关；所述第十一开关的第一端与所述阻抗调节电路的第一端耦接；所述第十一开关的第二端和所述第十二开关的第一端均与所述第一可调电容的第二端耦接；所述第十二开关的第二端与所述输出端口耦接。10. The tuning circuit according to any one of claims 2-9 is characterized in that it also includes: an eleventh switch and a twelfth switch; the first end of the eleventh switch is coupled to the first end of the impedance adjustment circuit; the second end of the eleventh switch and the first end of the twelfth switch are both coupled to the second end of the first adjustable capacitor; the second end of the twelfth switch is coupled to the output port. 11.根据权利要求10所述的调谐电路，其特征在于，所述第十一开关和所述第二开关为同一个单刀多掷开关；其中，所述第十一开关的第一端和所述第二开关的第二端为所述单刀多掷开关的公共端；所述第十一开关的第二端为所述单刀多掷开关的第一触点；所述第二开关的第一端为所述单刀多掷开关的第二触点。11. The tuning circuit according to claim 10 is characterized in that the eleventh switch and the second switch are the same single-pole multi-throw switch; wherein the first end of the eleventh switch and the second end of the second switch are common ends of the single-pole multi-throw switch; the second end of the eleventh switch is a first contact of the single-pole multi-throw switch; and the first end of the second switch is a second contact of the single-pole multi-throw switch. 12.一种调谐方法，其特征在于，应用于调谐电路，所述调谐电路包括输入端口、输出端口、第一开关、第二开关以及阻抗调节电路；所述第一开关的第一端与所述输入端口耦接；所述第一开关的第二端与所述输出端口耦接；所述第二开关的第一端与所述输入端口耦接；所述第二开关的第二端与所述阻抗调节电路的第一端耦接；所述阻抗调节电路的第二端接地，且所述阻抗调节电路包括并联在所述阻抗调节电路的第一端和第二端之间的第三开关和第一阻抗元件；所述方法包括：12. A tuning method, characterized in that it is applied to a tuning circuit, the tuning circuit comprising an input port, an output port, a first switch, a second switch and an impedance adjustment circuit; the first end of the first switch is coupled to the input port; the second end of the first switch is coupled to the output port; the first end of the second switch is coupled to the input port; the second end of the second switch is coupled to the first end of the impedance adjustment circuit; the second end of the impedance adjustment circuit is grounded, and the impedance adjustment circuit comprises a third switch and a first impedance element connected in parallel between the first end and the second end of the impedance adjustment circuit; the method comprises: 闭合所述第一开关；closing the first switch; 通过所述第二开关和所述第三开关的多个开关组合状态对与所述输出端口连接的负载进行调谐。A load connected to the output port is tuned by a plurality of switch combination states of the second switch and the third switch. 13.根据权利要求12所述的方法，其特征在于，所述方法还包括：13. The method according to claim 12, characterized in that the method further comprises: 断开所述第一开关；Disconnecting the first switch; 通过所述第二开关和所述第三开关的多个开关组合状态对与所述输入端口连接的输入电路进行阻抗校准。The impedance of the input circuit connected to the input port is calibrated through a plurality of switch combination states of the second switch and the third switch. 14.一种调谐芯片，其特征在于，包括：衬板，以及设置在所述衬板上的如权利要求1-11任一项所述的调谐电路。14. A tuning chip, comprising: a liner, and a tuning circuit as claimed in any one of claims 1 to 11 arranged on the liner. 15.一种电子设备，其特征在于，包括射频集成电路、双向耦合器、天线以及权利要求14所述的调谐芯片；所述射频集成电路包括输出端和测量端；所述双向耦合器的输入端与所述射频集成电路的输出端耦接；所述调谐芯片的输入端口与所述双向耦合器的输出端耦接；所述调谐芯片的输出端口与所述天线耦接；所述双向耦合器的耦合端与所述射频集成电路的测量端耦接。15. An electronic device, characterized in that it includes a radio frequency integrated circuit, a bidirectional coupler, an antenna and the tuning chip described in claim 14; the radio frequency integrated circuit includes an output end and a measuring end; the input end of the bidirectional coupler is coupled to the output end of the radio frequency integrated circuit; the input port of the tuning chip is coupled to the output end of the bidirectional coupler; the output port of the tuning chip is coupled to the antenna; the coupling end of the bidirectional coupler is coupled to the measuring end of the radio frequency integrated circuit.
CN202311434986.9A 2023-10-30 2023-10-30 Tuning circuit, tuning method, tuning chip and electronic equipment Pending CN119921732A (en)

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CN114124251B (en) * 2021-12-01 2024-09-24 哲库科技(北京)有限公司 Calibration method, electronic device, chip and storage medium

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