WO2015089758A1

WO2015089758A1 - Voltage regulation circuit system

Info

Publication number: WO2015089758A1
Application number: PCT/CN2013/089808
Authority: WO
Inventors: 周玉龙
Original assignee: 海能达通信股份有限公司
Priority date: 2013-12-18
Filing date: 2013-12-18
Publication date: 2015-06-25

Abstract

A voltage regulation circuit system, applied to the technical field of electronic circuits. The voltage regulation circuit system comprises multiple amplifiers (11-1, 11-2) and digital-to-analog converters (10). A first input end (in1) of each of the amplifiers is separately connected to an output end (Out1, Out2) of the digital-to-analog converter, and is separately connected to different output ends. A first amplifier (11-1) among the multiple amplifiers is connected to a bias voltage circuit. A second input end (in2) of another amplifier (11-2) except the first amplifier is connected to an output end of another amplifier (11-1). In this manner, high-precision voltage regulation is implemented by using a low-bit-width DAC chip.

Description

Voltage regulation circuit system

The present invention relates to the field of electronic circuit technology, and in particular to a voltage regulating circuit system.

Background technique

In the design of electronic products, if a precision voltage adjustment circuit is required, it is generally implemented by a N-bit wide digital to analog converter (DAC) chip. The voltage accuracy that can be adjusted by using this DAC chip is mainly It is determined by the reference voltage and the bit width N, and the larger the bit width N, the higher the adjusted voltage accuracy. In order to achieve high-precision voltage regulation, a high-bitwidth DAC chip needs to be used in the circuit, but the high-bitwidth DAC chip is costly, and some high-bitwidth DAC chips require a license (LICENSE) to be purchased, so that comparison is made. trouble.

Summary of the invention

Embodiments of the present invention provide a voltage regulating circuit system for achieving high voltage accuracy adjustment using a low bit width DAC chip.

An embodiment of the present invention provides a voltage adjustment circuit system, including: a digital to analog converter and m amplifiers, wherein m is a positive integer greater than 1, wherein:

a first input end of each of the m amplifiers is respectively connected to an output end of the digital-to-analog converter, and is respectively connected to a different output end, and an output end of the amplifier is connected to the first input end;

The first amplifier of the m amplifiers is connected to a bias voltage circuit, and a second input of the amplifiers other than the first amplifier is connected to an output of another amplifier, the second input The terminal is the bias voltage terminal.

Embodiments of the present invention also provide a voltage regulating circuit system including a first digital to analog converter and an amplifier, wherein:

a first input end and a second input end of the amplifier are respectively connected to an output end of the first digital-to-analog converter, and are respectively connected to different output ends, an output end of the amplifier and the first input end Connection

The second input of the amplifier is a bias voltage terminal.

The embodiment of the invention further provides a voltage regulating circuit system, including a first digital-to-analog converter, and a second A digital to analog converter and x amplifiers, said X being greater than or equal to 3, wherein:

The first input end and the second input end of one of the X amplifiers are respectively connected to the output ends of the first digital-to-analog converter, and respectively connected to different output ends;

a first input end of the other of the X amplifiers is respectively connected to an output end of the second digital-to-analog converter, and is respectively connected to different output ends; an output end of the one amplifier is connected to one of the other amplifiers a second input of an amplifier, wherein a second input of the amplifier other than the one of the other amplifiers is coupled to an output of the other amplifier;

An output of each of the X amplifiers is coupled to the first input, and a second input of the amplifier is a bias voltage terminal.

It can be seen that the voltage regulating circuit system of this embodiment includes a plurality of amplifiers and digital-to-analog converters, wherein the first input end of each amplifier is respectively connected to the output end of the digital-to-analog converter, and respectively connected to different output ends; The first amplifier of the amplifiers is connected to the bias voltage circuit, and the second input of the amplifier other than the first amplifier is connected to the output of the other amplifier. The voltage regulation accuracy of one of the amplifier's output terminals can be used as a reference voltage to determine the voltage regulation accuracy of the other amplifier's output. Finally, the voltage can be adjusted with high precision through the low bit width DAC chip.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description It is merely some embodiments of the present invention, and other drawings may be obtained from those skilled in the art without departing from the drawings.

FIG. 2 is a schematic structural diagram of a voltage regulating circuit system according to an embodiment of the present invention; FIG. 2 is a schematic structural diagram of a voltage regulating circuit system according to an embodiment of the present invention; FIGS. 3a and 3b are diagrams of an embodiment of the present invention. FIG. 4 is a schematic structural diagram of another voltage regulating circuit system according to an embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, one of ordinary skill in the art does not create All other embodiments obtained under the premise of sexual labor are within the scope of protection of the present invention. Embodiments of the present invention provide a voltage adjustment circuit system, and a schematic structural diagram thereof is shown in FIGS. 1 a to 1 c, including a digital-to-analog converter and m amplifiers, where m is a positive integer greater than 1, wherein the digital-to-analog converter The bit width is N bits such as 12 bits, specifically:

The first input end inl of each of the m amplifiers is respectively connected to the output end of the digital-to-analog converter, and is respectively connected to different output ends, and the output end of the amplifier is connected with the first input end, and the amplifier can be connected to the amplifier through a resistor. An output terminal and a first input terminal; one of the m amplifiers (such as the first amplifier) is connected to the bias voltage circuit, and the second input terminal in2 of the amplifiers other than the first amplifier of the m amplifiers is connected to the other amplifier At the output, the output of one of the m amplifiers (such as the second amplifier) is not connected to the second input of the other amplifier, in2. Then, the output of the second amplifier is an overall output terminal of the voltage regulating circuit system, and can be connected to an adjustment load, which is an electronic device that needs to adjust the voltage through an analog signal.

It can be understood that each amplifier has two input terminals, a first input terminal 1 and a second input terminal in2, the first input terminal is the negative input terminal of the amplifier, and the second input terminal is the positive input terminal of the amplifier, which is connected. The bias voltage terminal of the bias voltage circuit can adjust the bias voltage connected to the second input terminal so that the amplifier outputs a certain range of voltages. The digital-to-analog converter can convert the digital signal into an analog signal output, which is a digital-to-analog converter with a low bit width N (such as N less than 16 or 12), and a digital to analog converter can include at least one output.

In a specific implementation process, at least one digital-to-analog converter may be included in the voltage regulating circuit system, and the voltage regulating circuit system may include the following methods:

(1) The voltage regulating circuit system shown in FIG. 1a includes a digital-to-analog converter 10 and m amplifiers (illustrated by taking two amplifiers 11-1 and 11-2 in FIG. 1a as an example), the digital-to-analog converter 10 includes m output terminals (two in the figure), and the m output terminals are respectively connected to the first input terminals in1 of the m amplifiers.

(2) The voltage regulating circuit system shown in FIG. 1b includes m digital-to-analog converters 10 (illustrated by taking two digital-to-analog converters in FIG. 1b as an example), and each digital-to-analog converter 10 includes only one output terminal. The outputs of the m digital-to-analog converters 10 are respectively connected to the first input terminals in 1 of the m amplifiers.

(3) The voltage regulating circuit system shown in FIG. 1c includes n digital-to-analog converters (two digital-to-analog converters 10-1 and 10-2, and three amplifiers 11-1, 11- in FIG. 2 and 11-3 as an example), n digital modules The output of the partial digital-to-analog converter 10-1 of the converter includes one, and the output of the other part of the digital-to-analog converter 10-2 includes a plurality of (the two output terminals are illustrated in FIG. 1c as an example), n digital modes The number of all outputs of the converter is m, and the m outputs are respectively connected to the first input terminal in1 of the m amplifiers.

In the voltage regulating circuit system shown in FIG. 1a and FIG. 1b, the output end of the amplifier 11-2 is not connected to the second input end of the other amplifier, and the output end of the amplifier 11-2 is used as the voltage regulating circuit system. The overall output out can be connected to adjust the load. In the voltage regulating circuit system shown in Fig. 1c, the output terminal of the amplifier 11-3 serves as the overall output out of the voltage regulating circuit system, and the adjustment load can be connected.

It should be noted that the first input terminal and the second input terminal, and the first amplifier and the second amplifier do not indicate a sequential relationship, but illustrate different input terminals and different amplifiers.

When the reference voltages corresponding to the outputs of the digital-to-analog converters respectively connected to the m amplifiers are equal or approximately equal, it is necessary to use the voltage regulating circuit system described in this embodiment, such as the digital-to-analog converters in FIGS. 1a and 1b. The reference voltage of the reference voltage terminal REF1 corresponding to the output terminal Out1 and the reference voltage of the reference voltage terminal REF2 corresponding to the output terminal Out2 need to be equal or approximately equal. However, with the voltage regulating circuit system of the present embodiment, the reference voltages corresponding to the outputs of the digital-to-analog converters are not necessarily equal or approximately equal, and the resistances in the circuit can be adjusted.

After the output of the digital-to-analog converter is connected to the first input terminal in1 of an amplifier 11-1, the voltage output from the output of the amplifier 11-1 can be set by the voltage V of the second input terminal in2. _Ffset , and a reference voltage corresponding to the output terminal Out1 of the digital-to-analog converter 10 connected to the amplifier 11-1 is determined by VRE _F1 , specifically if the output terminal OUT1 is connected to the first input terminal in1 of the amplifier 11-1 via the resistor R1 The first input terminal in1 is connected to the output terminal through the resistor R2, and the maximum output voltage of the amplifier 11-1 is (R2/R1). *VRE _F1 + V _offS et o. Further, the output terminal of the amplifier 11-1 is connected. In the second input of the other amplifier 11-2, the voltage determining the voltage range of the output of the other amplifier 11-2, the voltage of the second input terminal in2 of the other amplifier 11-2 is the voltage of the output of one amplifier 11-1. That is, ( R2 / R1 ) * VRE _F1 + V _offS et , then the maximum output voltage of the other amplifier 11-2 is ( R2 / R1 ) * VRE _F2 + ( R2 / R1 ) * VRE _F1 + V. _Ffset .

If VREK is equal, the maximum output voltage of the other amplifier 11-2 is 2* ( R2/R1 ) *VRE _F 2 +V _offset o where R1 and R2 can use the same resistance value.

In general, the digital-to-analog converter includes an output terminal and a reference voltage terminal corresponding to the output end, and the adjustment precision of the output voltage of the output of the digital-to-analog converter can pass through the digital-to-analog converter. The bit width N and the reference voltage VREF of the reference voltage terminal REF corresponding to the output terminal are determined, and may be specifically 1/2 ⁿ *VRE _F . For the voltage regulating circuit system of this embodiment, the output of one amplifier is connected to the second input of another amplifier, wherein the voltage adjustment precision of an amplifier output is 1/2 ⁿ *VRE _F , the amplifier After the output is connected to the second input of another amplifier, the reference voltage is 1/2 ⁿ *VRE _F , which determines the voltage regulation accuracy of the output of the other amplifier. Therefore, the voltage regulation accuracy of the output of the other amplifier is 1/2. ^N * ( 1/2 ⁿ *VRE _F ) = 1/2 ^2N *VRE _F . This is equivalent to the voltage regulation accuracy achieved by a 2N-bit wide digital-to-analog converter, thereby achieving high-accuracy voltage adjustment using a low-bit-width digital-to-analog converter. It can be seen that the voltage adjustment circuit system in the embodiment can adjust the voltage range, and the voltage adjustment precision is high, which can meet the actual needs of the user.

In practical applications, the regulating load that can be adjusted or controlled by analog signals is mainly connected to the overall output terminal of the voltage regulating circuit system, such as a voltage controlled oscillator (VCO). For example, the specific example shown in Figure 2 includes two amplifiers U1A and U1B, a digital-to-analog converter U2 (bit width N), a Field Programmable Gate Array (FPGA), and a regulated load. Transistor XI controlled by an analog signal, where:

The two outputs of the digital-to-analog converter U2, OutA and OutB, are respectively connected to the input of amplifier U1A.

The input terminal 5 of the U1B is connected, the output terminal 1 of the amplifier U1A is connected to the input terminal 3 through the resistor R, and the input terminal 2 of the amplifier U1A is connected to the bias voltage circuit, and the bias voltage circuit includes a resistor connected in series between the ground and the power source. The input terminal 2 is connected to the series connection point between the resistors; the output terminal 6 of the amplifier U1B is connected to the input terminal 5 through the resistor R, the input terminal 4 of the amplifier U1B is connected to the output terminal 1 of the amplifier U1A, and the output terminal 6 of the amplifier U1B is connected to the transistor XI. The output of the transistor XI is connected to the FPGA, the FPGA is used to acquire the frequency of the output of the transistor XI, and the output of the digital-to-analog converter U2 can also be adjusted by connecting with the digital-to-analog converter U2. The reference voltage corresponding to the reference voltage terminals corresponding to the two output terminals of the digital-to-analog converter U2 is directly set to be 1/2 ^N *3V3A.

In the actual adjustment process, the value of the digital-to-analog converter U2-output terminal OutB is first specified as a fixed value, such as any value between 0 and 1/2 ^N , such as 1/2 ^N — such that the output of the amplifier U1B is fixed. Value; can then be combined with the bias voltage of the input terminal 2 of the amplifier U1A to adjust the output voltage of the other output terminal OutA of the digital-to-analog converter U1, so that the amplifier U1A can output a constant value between 0.2 and 1.25 with a voltage accuracy of 1 /2 ^N * V _3V3A , at this time, the output of the transistor XI is fed back to the FPGA, and the FPGA determines whether the error of the output of the transistor XI is the smallest, and if so, the output of the output terminal OutA of the digital-to-analog converter U2 is locked; After adjusting the output voltage of the output terminal OutB of the digital-to-analog converter U2, the voltage adjustment accuracy of the amplifier U1B is 1/2 ^2N *V _3V3A .

The embodiment of the present invention further provides a voltage regulating circuit system, which is shown in FIG. 3a and FIG. 3b, and includes a digital-to-analog converter and an amplifier 21, wherein the bit width of the digital-to-analog converter is N bits, such as 8 bits, etc. Ground:

The first input terminal in1 and the second input terminal in2 of the amplifier 21 are respectively connected to the output end of the digital-to-analog converter, and are respectively connected to different output terminals, and the output end of the amplifier 21 is connected to the first input terminal in1; The second input is a bias voltage terminal. Wherein, the digital-to-analog converter can convert the digital signal into an analog signal output, which is a digital-to-analog converter with a low bit width N (such as N less than 12 or 16), and a digital to analog converter can include at least one output. The output of the amplifier 21 is the overall output _{out of} the voltage regulating circuit system, and can be connected to an adjustment load, which is an electronic device that needs to adjust the voltage through an analog signal, such as a voltage controlled oscillator and a transistor.

(1) The voltage regulating circuit system shown in FIG. 3a includes a digital-to-analog converter 20, the digital-to-analog converter 20 includes two output terminals, respectively, and a first input terminal in1 of the amplifier 21 The second input terminal in2 is connected.

(2) The voltage regulating circuit system shown in FIG. 3b includes two digital-to-analog converters 20-1 and 20-2, each of which includes only one output terminal, and the two digital-to-analog converters 20- The outputs of 1 and 20-2 are connected to a first input terminal in1 and a second input terminal in2 of the amplifier 21, respectively.

In practical applications, the regulating load that can be adjusted or controlled by analog signals is mainly connected to the overall output terminal of the voltage regulating circuit system, such as a voltage controlled oscillator (VCO).

In the voltage regulating circuit system of the embodiment, an output terminal out1 of the digital-to-analog converter is connected to the bias voltage terminal (ie, the second input end) of the amplifier 21, and an output terminal out1 of the digital-to-analog converter corresponds to the reference voltage. The reference voltage of the terminal is VRE _F1 , the voltage regulation precision of one output terminal out1 of the digital-to-analog converter is 1/2 ⁿ *VRE _F1 ; the other output terminal out2 of the digital-to-analog converter is connected to the first input terminal inl of the amplifier 21, setting The reference voltage of the other output terminal out2 of the digital-to-analog converter corresponding to the reference voltage terminal is νκΕ _Κ = 1/2 ^Ν *νκΕ _Ρ1 . Thus, the reference voltage VRE _F2 corresponding to the other output terminal out2 of the digital-to-analog converter connected to the first input terminal in1 of the amplifier 21 can be used as a reference voltage for measuring the output voltage accuracy of the amplifier 21. Then, the voltage regulation accuracy of the output of the amplifier 21 is 1/2 ^N * ( 1/2 ⁿ *VRE _F1 ) = 1/2 ^2N *VRE _F1 . This is equivalent to the voltage regulation accuracy achieved by a 2N-bit wide digital-to-analog converter, thereby achieving high-accuracy voltage adjustment using a low-bit-width digital-to-analog converter. In this embodiment, the maximum output voltage of the amplifier 21 is: ( R2 / Rl ) * V _REF2 + Vouti, where V _0utl is the output voltage of one output terminal out1 of the digital-to-analog converter.

It should be noted that the system in this embodiment is similar to the voltage adjustment circuit system shown in FIG. 1a to FIG. 1c, and can adopt a low bit width digital-to-analog converter to achieve high-precision voltage adjustment, but the implementation is different. For example, the reference voltages of the output terminals of the digital-to-analog converters 20 respectively connected to the two input terminals of the amplifier 21 may be different, that is, the reference voltages of the reference voltage terminals REF1 and REF2 shown in FIG. 3a and FIG. 3b may be different. . The embodiment of the invention further provides a voltage regulating circuit system, which is shown in FIG. 4a and FIG. 4b, and includes a plurality of first mode converters, a second digital to analog converter and X amplifiers (X is an integer greater than or equal to 3 In the figure, the amplifiers 32-1, 32-2 and 32-3 are taken as an example, where:

The first input end in1 and the second input end 2 of one of the X amplifiers (such as the amplifier 32-1 in the figure) are respectively connected to the output ends of the first digital-to-analog converter, and are respectively connected to different output terminals; The first input terminals inl of other amplifiers (such as amplifiers 32-2 and 32-3) are respectively connected to the output terminals of the second digital-to-analog converter, and are respectively connected to different output terminals, and the output of the above-mentioned amplifier 32-1 The terminal is connected to the second input terminal in2 of one of the other amplifiers (such as the amplifier 32-2), and the second input terminal in2 of the amplifier other than the amplifier 32-2 is connected to the output of the other amplifier. . The output of one of the other amplifiers (such as amplifier 32-3) is not connected to the second input of in2 of the other amplifier, in2. The output of the amplifier is the overall output of the voltage regulating circuit, and can be connected to an adjustment load, which is an electronic device that needs to adjust the voltage through an analog signal, such as a transistor and a voltage controlled oscillator.

The output of each of the X amplifiers is connected to the first input terminal in1, and the second input terminal in2 is a bias voltage terminal.

In a specific implementation process, the voltage regulating circuit system of the embodiment may include at least one first digital-to-analog converter and a second digital-to-analog converter. The voltage regulating circuit system may include the following methods:

(1) The voltage regulating circuit system shown in FIG. 4a includes a first digital-to-analog converter 30 and a second digital-to-analog converter 31. The first digital-to-analog converter 30 includes two output terminals out1 and out2. Separate The first input terminal in1 and the second input terminal in2 are connected to the amplifier 32-1, and the second digital-to-analog converter 31 includes X-1 output terminals out1 to outx-1 (illustrated by taking outl and out2 as an example) They are respectively connected to the first input terminal in1 of the other amplifiers (amplifiers 32-2 and 32-3).

(2) The voltage regulating circuit system shown in FIG. 4b includes two first digital-to-analog converters 30-1 and 30-2, each of which includes only one output terminal, the two The outputs of a digital to analog converter 30-1 and 30-2 are coupled to a first input terminal in1 and a second input terminal in2 of the amplifier 32-1, respectively.

And also includes x-1 second digital-to-analog converters (such as the second digital-to-analog converter 31-2 in Figure 4b and

31- 2), each of the second digital-to-analog converters includes only one output, and the outputs of the second digital-to-analog conversions are respectively connected to the first input terminals in1 of the other amplifiers (amplifiers 32-2 and 32-3) .

It should be noted that, in other specific embodiments, the voltage regulating circuit system may further include y second digital-to-analog converters, and the output ends of the second digital-to-analog converters of the y second digital-to-analog converters include The output of the other part of the second digital-to-analog converter includes a plurality of outputs, and the number of all the output ends of the y data converters is X-1. Moreover, the first digital-to-analog converter and the second digital-to-analog converter described above do not indicate sequential relationships, but rather illustrate different digital-to-analog converters.

In this embodiment, in the voltage regulating circuit system of the embodiment, the bit widths of the first digital-to-analog converter and the second digital-to-analog converter are both N, at the bias voltage end of one amplifier 32-1 (ie, The second input end in2) is connected to the output endout1 of the first digital-to-analog converter, and the reference voltage corresponding to the output endout1 of the first digital-to-analog converter is VRE _F1 , and the voltage adjustment precision of the output end of the first digital-to-analog converter is 1/2 ⁿ *VRE _F1 ; the other output end out2 of the first digital-to-analog converter is connected to the first input end in1 of the amplifier 21, and the reference voltage corresponding to the reference voltage end of the other output end out2 of the first digital-to-analog converter is set to

Therefore, the voltage accuracy of the reference voltage corresponding to the output terminal out2 of the first digital-to-analog converter connected to the first input terminal in1 of the amplifier 32-1 can be used as a reference voltage for measuring the accuracy of the output voltage of the amplifier, and the amplifier

The voltage regulation accuracy of the 32-1 output is 1/2 ^N * ( 1/2 ⁿ *VRE _F1 ) = 1/2 ^2N *VRE _F1 . Further, the output of the amplifier 32-1 is connected to the second input of another amplifier 32-2, assuming a reference voltage corresponding to the output of the second digital-to-analog converter connected to the first input of the amplifier 32-1 For V, RE _F1 , set V, RE _F1 and VRE _F ^S are equal or equal, then the voltage regulation accuracy of the output of the other amplifier 32-2 is 1/2 ^N * ( 1/2 ^2N *VRE _F1 ) =1 /2 ^3N *VRE _F1 , and so on, the voltage regulation accuracy of the overall output of the voltage regulation circuit system is finally 1/2 ^{( x +1 ) n} *VRE _F1 . This is equivalent to the voltage regulation accuracy achieved by a (X+1) N-bit wide digital-to-analog converter, thereby achieving high voltage accuracy using a low bit width digital-to-analog converter. Adjustment.

In this embodiment, the maximum voltage outputted by the output of the amplifier 32-1 is (R2/R1)*VRE _F2 +Voutl, where V _0UTL is the output voltage of one output terminal out1 of the first digital-to-analog converter, and VRE _F2 is The reference voltage corresponding to the other output terminal out2 of the first digital-to-analog converter; then the maximum voltage outputted by the output of the amplifier 32-2 is (R2/R1) *V _REF2 +Vouti+ ( 2/R1 ) *V, RE _F1 = ( R2/R1 ) *V _REF2 +Vouti+ ( R2/R1 ) * VRE _F2 =2* ( R2/R1 ) *VRE _F2 +V _0UTL . By analogy, the final circuit output system (including X amplifiers) has a maximum output voltage of X* ( R2/R1 ) *V _REF2 +Vouti o

The voltage regulation circuit system provided by the embodiment of the present invention is described in detail above, and is used herein to help understand the method and core idea of the present invention. Meanwhile, for those skilled in the art, according to the idea of the present invention, The details of the present invention and the scope of the application are subject to change. The contents of the present specification are not to be construed as limiting the present invention.

Claims

Rights request

1. A voltage regulation circuit system, characterized in that it includes: a digital-to-analog converter and m amplifiers, where m is a positive integer greater than 1, where:

The first input terminal of each of the m amplifiers is connected to the output terminal of the digital-to-analog converter, and is respectively connected to a different output terminal, and the output terminal of the amplifier is connected to the first input terminal;

The first amplifier among the m amplifiers is connected to a bias voltage circuit, the second input terminals of other amplifiers among the m amplifiers except the first amplifier are connected to the output terminal of another amplifier, and the second input The terminal is the bias voltage terminal.

2. The system of claim 1, wherein the voltage adjustment circuit system includes m digital-to-analog converters, and the digital-to-analog converters include an output terminal; or,

The voltage regulation circuit system includes a digital-to-analog converter, and the digital-to-analog converter includes m output terminals.

3. The system of claim 1, characterized in that,

The voltage regulation circuit system includes n digital-to-analog converters, among the n digital-to-analog converters, one output terminal of the digital-to-analog converter is included, and the output terminals of another part of the digital-to-analog converters include multiple, the n The number of all output terminals of a digital-to-analog converter is m.

4. The system according to any one of claims 1 to 3, further comprising an adjustment load connected to the output end of the second amplifier among the m amplifiers,

The output terminal of the second amplifier is not connected to the second input terminal of another amplifier.

5. A voltage regulation circuit system, characterized by including a digital-to-analog converter and an amplifier, wherein:

The first input terminal and the second input terminal of the amplifier are respectively connected to the output terminal of the digital-to-analog converter, and are respectively connected to different output terminals, and the output terminal of the amplifier is connected to the first input terminal;

The second input terminal of the amplifier is a bias voltage terminal.

6. The system of claim 5, wherein the voltage adjustment circuit system includes two digital-to-analog converters, and the digital-to-analog converter includes an output terminal; or,

The voltage regulation circuit system includes a digital-to-analog converter, and the digital-to-analog converter includes two input Come out.

7. The system according to claim 5 or 6, further comprising an adjustment load connected to the output end of the amplifier.

8. A voltage regulation circuit system, characterized by including a first digital-to-analog converter, a second digital-to-analog converter and X amplifiers, where X is greater than or equal to 3, where:

The first input terminal and the second input terminal of one of the X amplifiers are respectively connected to the output terminal of the first digital-to-analog converter, and are respectively connected to different output terminals;

The first input terminals of other amplifiers among the X amplifiers are respectively connected to the output terminals of the second digital-to-analog converter, and are respectively connected to different output terminals; The second input terminal of an amplifier, the second input terminal of the amplifier other than the certain amplifier among the other amplifiers is connected to the output terminal of the other amplifier;

The output terminal of each of the X amplifiers is connected to the first input terminal, and the second input terminal of the amplifier is a bias voltage terminal.

9. The system of claim 8, characterized in that,

The voltage adjustment circuit system includes two first digital-to-analog converters, and the first digital-to-analog converter includes an output terminal, or the voltage adjustment circuit system includes one first digital-to-analog converter, and the first digital-to-analog converter includes an output terminal. The analog-to-analog converter includes two outputs; or,

The voltage adjustment circuit system includes The two digital-to-analog converters include terminals include one, and the output terminals of another part of the second digital-to-analog converter include multiple, and the number of all output terminals of the y data converters is x-l.

10. The system according to claim 8 or 9, further comprising an adjusting load, the adjusting load is connected to the output end of an amplifier of the X amplifiers whose output end is not connected to the second input end of another amplifier. connect.