CN109245746B - a signal generating circuit - Google Patents

Abstract

A signal generating circuit is used to generate an exponential signal with better effect. The signal generating circuit includes a first signal amplifying circuit and a sample-holding circuit, wherein: the first signal amplifying circuit is used to amplify the input signal of the first signal amplifying circuit with a first set multiple, and output a first analog signal to the sampling-holding circuit The input signal amplified by the first signal amplifying circuit for the first time is the input signal of the signal generating circuit; the sampling and holding circuit is used to save the first analog signal output by the first signal amplifying circuit, and the count value is added to the count value every time the first analog signal is saved. One, the initial value of the count value is zero; when the count value is less than N, the first analog signal saved last time is output to the first signal amplifying circuit as the input signal of the first signal amplifying circuit; when the count value is equal to N , output the first analog signal saved most recently as the first index signal, where N is an integer greater than one.

Description

a signal generating circuit

technical field

The present invention relates to the technical field of circuits, in particular to a signal generating circuit.

Background technique

In the field of circuit technology, some form of signal, such as a square wave signal, a logarithmic signal or an exponential signal, is usually generated by a signal generating circuit. According to different requirements, the generated signal can be used as a control signal, a clock source signal or a driving signal, etc. The signal generating circuit for generating the exponential signal includes a triode, and the signal generating circuit uses the exponential volt-ampere characteristic of the triode to perform exponential operation on the linear signal to obtain the exponential signal.

For example, when adjusting the brightness of a light emitting diode (Light Emitting Diode, LED), in order to allow the user to perceive a delicate and soft dimming effect, an exponential driving signal needs to be generated to drive the LED. The driving circuit is shown in FIG. 1 . In Fig. 1, the linear signal is input to the signal generating circuit to generate an exponential signal, and the exponential signal passes through the power driving circuit to generate an exponential signal for adjusting the brightness of the LED. In Figure 1, since the signal generating circuit utilizes the inherent exponential volt-ampere characteristics of the triode to generate the exponential signal, and the triode can only generate the exponential signal with the base e, the signal generating circuit can only generate the exponential signal with the base e. In addition, with the change of the junction temperature of the triode, the volt-ampere characteristics of the triode will change, which will affect the output of the exponential signal. Therefore, in the driving circuit shown in Figure 1, it is necessary to configure a temperature compensation circuit for the signal generation circuit, so as to Compensate for changes in transistor junction temperature.

It can be seen that the existing signal generation circuit for generating exponential signals needs to be equipped with a temperature compensation circuit, which increases the complexity of the signal generation circuit; and due to the inherent limitation of the exponential volt-ampere characteristic of the triode, it can only generate a base number e. The exponential signal cannot be generated with an arbitrary constant as the base, and the types of exponential signals are limited. Therefore, the effect of the exponential signal generated by the existing signal generating circuit is poor.

In conclusion, there is an urgent need for a signal generating circuit capable of generating an exponential signal with better effects.

SUMMARY OF THE INVENTION

An embodiment of the present invention provides a signal generating circuit for generating an exponential signal with better effect.

In a first aspect, an embodiment of the present invention provides a signal generation circuit, the signal generation circuit includes a first signal amplification circuit and a sample-and-hold circuit, wherein:

The first signal amplifying circuit is used to amplify the input signal of the first signal amplifying circuit by using the first set multiple, and output the first analog signal to the sampling and holding circuit, and the input signal amplified by the first signal amplifying circuit for the first time is the input of the signal generating circuit Signal;

The sample and hold circuit is used to save the first analog signal output by the first signal amplifying circuit; the count value is increased by one every time the first analog signal is saved, and the initial value of the count value is zero; when the count value is less than N, The first analog signal saved last time is output to the first signal amplifying circuit as the input signal of the first signal amplifying circuit; when the count value is equal to N, the first analog signal saved last time is output as the first index signal, Wherein, N is an integer greater than one.

When the signal generating circuit provided in the first aspect is used to generate the first index signal, since the first signal amplifying circuit uses the first set multiple to amplify the input signal of the signal generating circuit N times, the base of the generated first index signal is The first set multiple, the index of the generated first index signal is N, and the amplitude of the generated first index signal is the input signal of the signal generation circuit, that is, the first signal amplification circuit adopts the first set multiple B to After the input signal A of the signal generating circuit provided by the first aspect is amplified N times, the first index signal is in the form of A*B ^N. For the first index signal, the base is the first set multiple B, and the index is N, The amplitude is the input signal A of the signal generating circuit provided in the first aspect. Therefore, the base of the first exponent signal can be set by setting the first set multiple, the exponent of the first exponent signal can be set by setting the value of N, and the exponent of the first exponent signal can be set by setting the input signal of the signal generating circuit. Determine the amplitude of the first exponential signal. Therefore, the signal generating circuit provided by the first aspect can generate the first exponential signal with an arbitrary constant (the first set multiple) as the base. Compared with the prior art that can only generate the exponential signal with the base e, the first exponential signal The signal generating circuit provided by the aspect can generate an exponential signal with better effect.

In addition, since the signal generating circuit provided by the first aspect relies on the first signal amplifying circuit to amplify the input signal of the signal generating circuit N times to realize the generation of the first index signal, and the first signal amplifying circuit inputs the signal generating circuit When the signal is amplified, it is not necessary for the first signal amplifying circuit to work in a certain temperature range, so it is not necessary to configure a temperature compensation circuit for the signal generating circuit as in the prior art. Therefore, compared with the prior art, the signal provided by the first aspect does not need to be The structure of the generating circuit is simpler.

In a possible design, the sample-and-hold circuit may specifically include: a sample-and-hold device for storing the first analog signal output by the first signal amplifying circuit every time; a counter for storing the first analog signal every time the sample-and-hold device The count value is increased by one when the signal is generated; the output controller is used for outputting the first analog signal saved by the sample holder last time to the first signal amplifying circuit as the input signal of the first signal amplifying circuit when the counting value is less than N; When the count value is equal to N, the first analog signal last saved by the sample holder is output as the first index signal.

In the above solution, one sample-and-hold device is set in the sample-and-hold circuit. In actual implementation, two sample-and-hold devices can also be set in the sample-and-hold circuit, and the first sample-and-hold device is used to store the first signal output by the first signal amplifying circuit. analog signal, and output the saved first analog signal to the output controller; the second sample-and-hold is used to save the input signal when the input signal of the signal generating circuit is input, and the output controller judges the need to send the first analog signal according to the count value according to the count value. When an analog signal is output to the first signal amplifying circuit, the first analog signal output by the output controller is saved. According to the above functional division, the first sample-and-hold is connected to the output end of the first signal amplifying circuit, and the second sample-and-hold is connected to the input end of the first signal amplifying circuit. The above-mentioned implementation of setting two sample-and-holds in the sample-and-hold circuit actually divides one of the sample-and-holds in the above-mentioned implementation into two modules by function, and the functions of these two modules are respectively composed of the first sample-and-hold and the The second sample-and-hold implementation.

With the above solution, each function of the sample-and-hold circuit is realized by a sample-and-hold device, a counter and an output controller respectively, and a specific implementation manner of the sample-and-hold circuit is provided.

In a possible design, when the signal generating circuit provided in the first aspect generates the first index signal, the value of N may be preset by the sample and hold circuit, or may be set by means of pulse width modulation. When N is set by means of pulse width modulation, the signal generating circuit further includes a pulse width modulator, the pulse width modulator is used to generate a rectangular wave signal, and output the rectangular wave signal to the sample and hold circuit, then the sample and hold circuit can be based on the rectangular wave signal. The duty cycle of the wave signal determines the value of N.

In a possible design, the above-mentioned signal generating circuit further includes: a second signal amplifying circuit, the second signal amplifying circuit is used to amplify the first exponential signal by using a second preset multiple to obtain a second exponential signal as the above-mentioned signal produce the output of the circuit.

With the above solution, not only can the amplitude of the exponential signal output by the signal generating circuit be flexibly adjusted by setting the second set multiple of the second signal amplifying circuit, but also when the base of the exponential signal to be generated satisfies the set condition, the The formula is simplified to reduce the amplification times of the first signal amplifying circuit, thereby reducing the processing load of the first signal amplifying circuit, and improving the efficiency of the signal generating circuit for generating the exponential signal.

In a possible design, when the input signal of the signal generating circuit is a voltage signal, if an exponential current signal is to be generated, the signal generating circuit may further include a signal converter, the signal converter is used to generate the first exponential signal When it is a voltage signal, the first index signal is converted from a voltage signal to a current signal.

With the above scheme, when the generated first index signal is used to drive or control some devices in other circuits, the above scheme is adopted because the current signal is used to drive or control more accurately than the voltage signal is used to drive or control. , the generated first index signal can meet high-precision driving and control requirements.

Description of drawings

1 is a schematic structural diagram of a signal generating circuit provided by the prior art;

FIG. 2 is a schematic structural diagram of a first signal generating circuit provided by an embodiment of the present invention;

3 is a schematic structural diagram of a second signal generating circuit provided by an embodiment of the present invention;

4 is a schematic structural diagram of a third signal generating circuit provided by an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a fourth signal generating circuit provided by an embodiment of the present invention.

Detailed ways

For a better understanding of the above objects, solutions and advantages of the embodiments of the present invention, detailed descriptions are provided below. The detailed description illustrates various embodiments of apparatuses and/or methods through the use of block diagrams, flowcharts, etc., drawings and/or examples. In these block diagrams, flowcharts and/or examples, one or more functions and/or operations are included. Those skilled in the art will appreciate that the various functions and/or operations within these block diagrams, flowcharts, or examples can be implemented individually or collectively by a variety of hardware, software, firmware, or by any combination of hardware, software, and firmware. Combination implementation.

In order to generate an exponential signal with better effect, an embodiment of the present invention provides a signal generating circuit. As shown in FIG. 2, the signal generating circuit 200 includes a first signal amplifying circuit 201 and a sample-holding circuit 202, wherein:

The first signal amplifying circuit 201 is used for amplifying the input signal of the first signal amplifying circuit 201 by adopting the first preset multiple, and outputting the first analog signal to the sampling and holding circuit 202;

Wherein, the input signal amplified by the first signal amplification circuit 201 for the first time is the input signal of the signal generation circuit 200;

The sample and hold circuit 202 is used to save the first analog signal output by the first signal amplification circuit 201; the count value is increased by one each time the first analog signal is saved, wherein the initial value of the count value is zero; when the count value is less than When N, the first analog signal saved last time is output to the first signal amplifying circuit 201 as the input signal of the first signal amplifying circuit 201; when the count value is equal to N, the first analog signal saved last time is used as the first signal amplifying circuit 201. Exponential signal output, where N is an integer greater than one.

Optionally, the sample-and-hold circuit 202 may specifically include: a sample-and-hold device for storing the first analog signal output by the first signal amplifying circuit each time; a counter for storing the first analog signal every time the sample-and-hold device saves the first analog signal. The count value is increased by one; the output controller is used to output the first analog signal saved by the sample holder last time as the input signal of the first signal amplifying circuit to the first signal amplifying circuit when the count value is less than N; when the count value is When it is equal to N, the first analog signal last saved by the sample-holding device is output as the first index signal.

Each function of the sample-and-hold circuit 202 is implemented by a sample-and-hold device, a counter, and an output controller, respectively, and a specific implementation manner of the sample-and-hold circuit 202 is provided.

In the above implementation manner, one sample-and-hold is set in the sample-and-hold circuit 202. In actual implementation, two sample-and-holds may also be set in the sample-and-hold circuit 202, and the first sample-and-hold is used to store the output of the first signal amplifying circuit. The first analog signal is stored, and the stored first analog signal is output to the output controller; the second sample holder is used to save the input signal when the input signal of the signal generating circuit is input, and the output controller judges according to the count value When the first analog signal needs to be output to the first signal amplifying circuit, the first analog signal output by the output controller is saved. According to the above functional division, the first sample-and-hold is connected to the output end of the first signal amplifying circuit, and the second sample-and-hold is connected to the input end of the first signal amplifying circuit. The above-mentioned implementation of setting two sample-and-holds in the sample-and-hold circuit 202 actually divides one of the sample-and-holds in the above-mentioned implementation into two modules by function, and the functions of these two modules are respectively determined by the first sample-and-hold. and a second sample-and-hold implementation.

It should be noted that, when the count value is used to count the number of times the first analog signal is stored by the sample holder, the initial value of the count value is usually set to zero. Therefore, if a first index signal with an index of N needs to be generated, the sample-and-hold circuit outputs the first analog signal saved most recently as the first index signal when the count value is N. The above is a common counting method. Of course, in the embodiment of the present invention, the initial value of the count value may also be set to be non-zero. For example, if the initial value of the count value is set to 2, then if a first index signal with an index of N needs to be generated, the sample-and-hold circuit is counting When the value is N+2, the first analog signal saved last time is output as the first index signal. The manner in which the initial value of the count value is not zero should be regarded as a common expansion manner of the manner of counting the count value in the embodiment of the present invention. If a certain signal generation circuit changes the initial value of the count value to a value other than zero when counting the count value, but other features of the signal generation circuit are the same as the corresponding features of the signal generation circuit 200 provided by the embodiment of the present invention, Then, the signal generating circuit should also be regarded as falling within the protection scope of the embodiments of the present invention.

Optionally, when the signal generating circuit 200 generates the first index signal, the value of N may be preset by the sample-hold circuit 202, or may be set by means of pulse width modulation. When N is set by means of pulse width modulation, the signal generating circuit 200 further includes a pulse width modulator, the pulse width modulator is used to generate a rectangular wave signal and output the rectangular wave signal to the sample and hold circuit 202, then the sample and hold circuit 202 The value of N can be determined according to the duty cycle of the rectangular wave signal.

For example, assuming that the duty cycle of the rectangular wave signal output by the pulse width modulator is 1, the value of N is 10; then when the duty cycle of the rectangular wave signal output by the pulse width modulator is 0.2, the value of N can be determined is 2; when the duty cycle of the rectangular wave signal output by the pulse width modulator is 0.7, the value of N can be determined to be 7.

When the generated first index signal is used to drive or control some devices in other circuits, such as for driving LEDs, that is, for adjusting the brightness of LEDs, the device is driven by a current signal compared to driving by a voltage signal. The driving accuracy is higher when the current signal is used to drive. Therefore, if the input signal of the signal generating circuit 200 is a voltage signal, the generated first index signal is also a voltage signal after being processed by the signal generating circuit 200 . At this time, in order to improve the driving precision of the first index signal, a signal converter may be further provided in the signal generating circuit 200, and the signal converter is used to convert the first index signal from a voltage signal to a current signal.

After the first index signal is converted from a voltage signal to a current signal, the precision requirement when the first index signal drives or controls some devices in other circuits can be met, that is, the effect of the generated first index signal is better.

It should be noted that, if the input signal of the signal generation circuit 200 is a voltage signal, the sample-and-hold circuit 202 is a sample-and-hold circuit that can store, count and output the voltage signal; if the input signal of the signal generation circuit 200 is a current signal , the sample and hold circuit 202 is a sample and hold circuit that can store, count and output the current signal.

In this embodiment of the present invention, the first set multiple may be a positive real number or a negative real number. If the first set multiple is a negative real number, then when N is an odd number, the first index signal is a negative index signal, and when N is an even number, the first index signal is a positive index signal; if the first set multiple is If N is an odd or even number, the first exponential signal is a positive exponential signal. The specific reasons are as follows:

When the signal generating circuit 200 is used to generate the first index signal, assuming that the input signal of the signal generating circuit 200 is A and the first set multiple is B, the first index signal output by the signal generating circuit 200 is A*B ^N . It can be seen from this that if the first set multiple B is a negative real number, since A is a positive real number, then when N is an odd number, the first index signal A*B ^N is a negative value, and when N is an even number, the first index signal A*B N is a negative value. The exponential signal A*B ^N is a positive exponential signal; if the first set multiple B is a positive real number, then no matter N is an odd number or an even number, the first exponential signal A*B ^N is a positive value.

Therefore, if the first index signal output by the signal generation circuit 200 is a negative index signal, a signal amplifying circuit with an amplification factor of -1 can be set to amplify the first index signal, so as to realize the first index signal output by the signal generation circuit 200. An exponential signal is a positive exponential signal.

When the signal generating circuit 200 shown in FIG. 2 is used to generate the first index signal, since the first signal amplifying circuit 201 uses the first set multiple to amplify the input signal of the signal generating circuit 200 N times, the generated first index signal has a The base is the first set multiple, the index of the generated first index signal is N, and the amplitude of the generated first index signal is the input signal of the signal generating circuit 200, that is, the first signal amplifying circuit adopts the first setting. After the fixed multiple B amplifies the input signal A of the signal generating circuit 200 N times, the first exponential signal is in the form of A*B ^N. For the first exponential signal, the base is the first set multiple B, the exponent is N, and the amplitude is N. The value is the input signal A of the signal generating circuit 200 . When the signal generating circuit 200 shown in FIG. 2 is used to generate the first index signal, the base of the first index signal can be set by setting the first set multiple, and the first index signal can be set by setting the value of N The amplitude of the first index signal can be set by setting the input signal of the signal generating circuit 200 . Therefore, the signal generating circuit 200 can generate the first exponential signal with an arbitrary constant (the first set multiple) as the base. Compared with the prior art that can only generate the exponential signal with the base e, the signal shown in FIG. 2 The generating circuit 200 can generate an exponential signal with better effect.

In addition, since the signal generating circuit 200 relies on the first signal amplifying circuit 201 to amplify the input signal of the signal generating circuit 200 N times to generate the first index signal, and the first signal amplifying circuit 201 amplifies the input signal of the signal generating circuit 200 When performing amplification, it is not necessary for the first signal amplifying circuit 201 to operate in a certain temperature range, so it is not necessary to configure a temperature compensation circuit for the signal generating circuit 200 as in the prior art. The structure is simpler.

In addition, in order to meet the amplitude requirement of the exponential signal output by the signal generating circuit 200, the signal generating circuit may further include: a second signal amplifying circuit, the second signal amplifying circuit is used to amplify the first exponential signal by adopting a second preset multiple , the second index signal is obtained as the output of the signal generating circuit 200 . For example, when the input signal of the signal generating circuit 200 is A, to generate an exponential signal in the form of A*C* ^BN , the first setting multiple in the signal generating circuit 200 can be set to B and the second setting multiple to be C. , then the first index signal is A*B ^N , the second index signal is A*C*B ^N , and the second index signal is used as the output signal of the signal generation circuit 200 to satisfy the amplitude of the index signal output by the signal generation circuit 200 value requirement.

By setting the second signal amplifying circuit, not only can the amplitude of the exponential signal output by the signal generating circuit 200 be flexibly adjusted by setting the second set multiple of the second signal amplifying circuit, but also the first signal can be reduced in some cases. The specific reasons for the amplification times of the signal amplification circuit 201 will be described in detail in Example 3 below.

In conjunction with the above description of the signal generation circuit 200 and its various possible implementations, three examples of the signal generation circuit 200 are given below. These three examples can be regarded as three specific implementations of the signal generating circuit 200 .

Example 1

When the input signal of the signal generating circuit is a voltage signal, the signal generating circuit may be as shown in FIG. 3 . In Fig. 3, the input signal of the signal generating circuit is saved by the first sample-and-holding device and then output to the first signal amplifying circuit. The first signal amplifying circuit uses the first set multiple to amplify the input signal of the signal generating circuit to obtain the The analog signal is output to the second sample-and-hold, and the second sample-and-hold saves the output first analog signal and outputs it to the output controller. When the count value of the output controller in the counter is less than N, the first analog signal is The signal is input to the first sample-and-hold, and then continues to amplify the first analog signal with the first set multiple; when the count value is equal to N, the output controller outputs the first analog signal as the first index signal to the signal conversion The signal converter converts the first index signal from a voltage signal into a current signal, and the first index signal converted into a current signal is used as an exponential current signal finally output by the signal amplifying circuit.

Example 2

When the input signal of the signal generating circuit is a current signal, the signal generating circuit may be as shown in FIG. 4 . In FIG. 4, the input signal of the signal generating circuit is saved by the first sample-and-hold and then output to the first signal amplifying circuit. The first signal amplifying circuit uses the first set multiple to amplify the input signal of the signal generating circuit to obtain the first The analog signal is output to the second sample-and-hold, and the second sample-and-hold saves the output first analog signal and outputs it to the output controller. When the count value of the output controller in the counter is less than N, the first analog signal is The signal is input to the first sample-and-hold, and then continues to amplify the first analog signal with the first set multiple; when the count value is equal to N, the output controller outputs the first analog signal as the first index signal. When the input signal of the signal generating circuit is a current signal, the first exponential signal is also a current signal, so the signal generating circuit shown in Fig. 4 can output an exponential form without configuring a signal converter like the signal generating circuit shown in Fig. 3 current signal.

Example three

When the input signal of the signal generating circuit is a voltage signal and the first index signal in the form of (1+A) ^N needs to be generated, the signal generating circuit can be shown in FIG. 5 , where A is greater than 0 and much less than 1.

According to Newton's binomial formula, when A is greater than 0 and much less than 1, (1+A) ^x = (1+A*x), that is, through Newton's binomial formula, (1+A) ^N Simplifies so that the number of times the input signal is amplified is reduced by x times.

When the first exponential signal in the form of (1+A) ^N needs to be generated, the first exponential signal can be simplified by using the Newton binomial formula to reduce the amplification times of the first signal amplifying circuit. Assuming N=n*m+b, then (1+A) ^N can be simplified to (1+A*b)*B ^m , where B=(1+A) ⁿ , and B=(1+A) ⁿ can be Simplifies to B=1+A*n, ie (1+A) ^N =(1+A*b)*Bm=(1+A*b)*(1+A* ^{n)m .} Therefore, when the input voltage signal is 1V, generating the first index signal in the form of (1+A) ^N originally requires the first signal amplifying circuit to amplify the input signal N times by using the first set multiple of 1+A, and using the above After the simplified process, only the first signal amplifying circuit needs to amplify the input signal m times by using the first set multiple 1+A*n, and output the first index signal, and the second signal amplifying circuit uses the second set multiple 1+A. *b Amplifies the first index signal, and obtains the second index signal, which can be used as the output of the signal generating circuit.

It should be noted that when using the above scheme to simplify the exponential signal (1+A) ^N , the sum of n, m and b in N=n*m+b is determined by dividing N by the integer m to obtain The quotient of the integer is n, and the remainder is b. In the embodiment of the present invention, the smaller the values of n and b, the higher the accuracy of simplification.

In the signal generating circuit shown in FIG. 5 , if it is necessary to generate the first index signal in the form of (1+A) ^N , the input signal of the signal generating circuit is saved by the first sampling and holding device and then output to the first signal amplifying circuit , the first signal amplifying circuit uses the first set multiple 1+A*n to amplify the input signal of the signal generating circuit to obtain the first analog signal, and outputs it to the second sampling and holding device, and the second sampling and holding device will output The first analog signal is saved and output to the output controller. When the count value in the counter is less than m, the output controller inputs the first analog signal to the first sample holder, and then continues to use the first analog signal for the first analog signal. Set a multiple of 1+A*n for amplification; when the count value is equal to m, the output controller outputs the first analog signal as the first index signal to the second signal amplifying circuit, and the second signal amplifying circuit adopts the second set multiple 1+A*b amplifies the first index signal to obtain the second index signal, and outputs it to the signal converter. The signal converter converts the second index signal from a voltage signal to a current signal, and converts it into a second index signal of the current signal. The current signal in exponential form as the final output of the signal amplification circuit.

In addition, if the simplification of the index signal to be generated is not considered, the signal generation circuit shown in FIG. 5 is compared with the signal generation circuit shown in FIG. 3 or FIG. The second signal amplifying circuit, the second signal amplifying circuit can amplify the first exponential signal by using the second preset multiple, so the signal generating circuit shown in FIG. 5 can flexibly adjust the amplitude of the output exponential signal.

To sum up, in the signal generating circuit shown in FIG. 5, not only can the amplitude of the exponential signal output by the signal generating circuit be flexibly adjusted by setting the second set multiple of the second signal amplifying circuit, but also the process can be simplified by formulas. The amplification times of the first signal amplifying circuit are reduced, thereby reducing the processing load of the first signal amplifying circuit, and improving the efficiency of the signal generating circuit for generating the exponential signal.

To sum up, the signal generating circuit 200 provided by the embodiment of the present invention can generate the first exponential signal with an arbitrary constant (the first set multiple) as the base, compared with the prior art that can only generate the exponential signal with the base e , the signal generating circuit 200 provided by the embodiment of the present invention can generate an exponential signal with better effect.

As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block in the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to the processor of a general purpose computer, special purpose computer, embedded processor or other programmable data processing device to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing device produce Means for implementing the functions specified in a flow or flow of a flowchart and/or a block or blocks of a block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory result in an article of manufacture comprising instruction means, the instructions The apparatus implements the functions specified in the flow or flow of the flowcharts and/or the block or blocks of the block diagrams.

These computer program instructions can also be loaded on a computer or other programmable data processing device to cause a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process such that The instructions provide steps for implementing the functions specified in the flow or blocks of the flowcharts and/or the block or blocks of the block diagrams.

Although the preferred embodiments of the present invention have been described, additional changes and modifications to these embodiments may occur to those skilled in the art once the basic inventive concepts are known. Therefore, the appended claims are intended to be construed to include the preferred embodiment and all changes and modifications that fall within the scope of the present invention.

Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the embodiments of the present invention. Thus, provided that these modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (7)

1. A signal generating circuit comprising a first signal amplifying circuit, a sample-and-hold circuit, and an output controller, wherein:

the first signal amplifying circuit is configured to amplify a signal input to the first signal amplifying circuit to obtain a first signal, and output the first signal to the sample-and-hold circuit;

the sampling hold circuit is used for saving the first signal output by the first signal amplifying circuit;

the output controller is used for extracting the first signal in the sampling and holding circuit and outputting or transmitting the first signal back to the first signal amplifying circuit;

the output controller is used for returning the first signal to the first signal amplifying circuit until the first signal is amplified to a preset multiple by the first signal amplifying circuit, and the output controller outputs the first signal amplified to the preset multiple as a first exponential signal.

2. The signal generating circuit of claim 1, wherein the sample-and-hold circuit comprises:

a sample holder for holding a first signal output each time by the first signal amplifying circuit;

a counter for incrementing a count value by one each time the sample holder holds a first signal once;

the output controller is configured to output a first signal that is last held by the sample holder to the first signal amplifying circuit as an input signal of the first signal amplifying circuit when the count value is smaller than N; outputting a first signal last held by the sample-and-hold unit as the first exponent signal when the count value is equal to N;

and N is an integer greater than one.

3. The signal generating circuit according to claim 2, further comprising a pulse width modulator for generating a rectangular wave signal and outputting the rectangular wave signal to the sample-and-hold circuit;

the sampling hold circuit is further used for determining N according to the duty ratio of the rectangular wave signal.

4. The signal generating circuit of claim 1, wherein the first signal is an analog signal.

5. The signal generation circuit of claim 1, wherein the sample-and-hold circuit comprises a first sample-and-hold circuit for holding a signal input to the first signal amplification circuit and a second sample-and-hold circuit for holding the first signal.

6. The signal generating circuit according to any one of claims 1 to 5, wherein the first signal amplifying circuit is configured to amplify an input signal by a first set factor, the circuit further comprising:

and the second signal amplifying circuit is used for amplifying the first exponential signal by adopting a second set multiple to obtain a second exponential signal which is used as the output of the signal generating circuit.

7. The signal generating circuit of claim 1, further comprising:

and the signal converter is used for converting the first signal output by the output controller into a current signal.

Images