CN106067773A - A kind of variable-gain amplification circuit with high stable gain control - Google Patents
A kind of variable-gain amplification circuit with high stable gain control Download PDFInfo
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- CN106067773A CN106067773A CN201610634065.0A CN201610634065A CN106067773A CN 106067773 A CN106067773 A CN 106067773A CN 201610634065 A CN201610634065 A CN 201610634065A CN 106067773 A CN106067773 A CN 106067773A
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- gain
- variable
- digital
- amplifier
- gain control
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- 230000003321 amplification Effects 0.000 title claims abstract description 21
- 238000003199 nucleic acid amplification method Methods 0.000 title claims abstract description 21
- 238000013016 damping Methods 0.000 claims abstract description 22
- 230000008901 benefit Effects 0.000 claims abstract description 9
- 230000005611 electricity Effects 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 238000004088 simulation Methods 0.000 claims description 2
- 230000003139 buffering effect Effects 0.000 claims 1
- 230000010349 pulsation Effects 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
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- Amplifiers (AREA)
- Analogue/Digital Conversion (AREA)
- Control Of Amplification And Gain Control (AREA)
Abstract
The invention discloses a kind of variable-gain amplification circuit with high stable gain control, including buffer circuit, damping resistance, variable gain amplifier and digital to analog converter.The invention have the advantages that 1) the buffer circuit front stage circuits that makes amplifying circuit be adapted to high impedance output is connected, can be interconnected impedance matching and adjust；2) damping resistance can improve the input impedance of variable gain amplifier, and the inside input resistance with variable gain amplifier constitutes attenuation network simultaneously, it is achieved the gain-variable scope of variable gain amplifier adjusts；3) output of digital to analog converter reference voltage and analog voltage output together decide on the gain of controllable gain amplifier, and the high stability of digital to analog converter output determines that gain control has high stability.Avoid because of the impact of power-supply fluctuation, drift and ground bounce noise etc., cause the problems such as the output pulsation of amplifying circuit, noise increase and gain control concordance difference.
Description
Technical field
The present invention relates to a kind of variable gain amplifier high stability amplifying circuit.
Background technology
Integrated voltage-controlled type variable gain amplifier is widely used in various Larger Dynamic signal processing.Owing to being to adopt
By Control of Voltage, so its gain control is the most flexible, it is simple to use, but when gain control method is improper, electricity can be caused
The problems such as the output pulsation on road, noise increase and gain control concordance difference.
The gain control method of pressure reduction control type variable gain amplifier is at present: use resistance pressure-dividing network by work electricity
The simple dividing potential drop of source voltage, provides gain control reference voltage for gain control negative terminal, or is directly connected by gain control negative terminal
Receiving earth terminal, gain control anode is connected with the gain-controlled voltage of system.The shortcoming of above-mentioned control mode is: 1) utilize
In the case of resistor voltage divider network produces reference voltage, when system works, the transient current on power supply is in undulating all the time
State, this current fluctuation will necessarily produce fluctuation on the power line, resistor network also can produce after dividing potential drop certain fluctuation, cause
The reference voltage terminal of gain control is unstable.Finally the gain control end at variable amplifier produces the control voltage of fluctuation.With
The voltage pulsation that controls of upper generation causes the gain fluctuation of amplifier, causes variable gain amplifier output amplitude to fluctuate and stronger
Noise output, system work can be affected in some requires higher application, serious meeting causes system gain control disorder；
It addition, system working power voltage exists certain error, supply voltage is compiled and has been moved set-point, also can make the control that dividing potential drop is formed
Reference voltage offset design value, the gain of the amplifier controlled offset design value therewith, eventually result in output amplitude and produce
Extra change, or make the problems such as gain control concordance difference.2) when gain control negative terminal being coupled directly to ground, owing to being
Can produce various noise during system work, in the case of digital signal, the transmission of pulse signal can be produced on ground wire
The strongest raw bounce-back noise, thus cause controlling terminal voltage difference and also can produce the strongest noise, cause gain-controlled voltage unstable
Fixed.
Summary of the invention
It is an object of the invention to affect for power-supply fluctuation, drift and ground bounce noise etc., the variable gain caused
Amplifier gain controls instability, the fluctuation of amplifying circuit output amplitude, noise increase and gain control drifts about with supply voltage,
The problem of concordance difference, develops a kind of variable-gain amplification circuit with high stable gain control, eliminate because of power-supply fluctuation,
The impact such as drift and noise causes the problem such as gain instability and gain control concordance difference.
The technical solution realizing the object of the invention is:
A kind of variable-gain amplification circuit with high stable gain control of the present invention, is characterized in that, adjustable including input resistance
Buffer circuit, damping resistance, variable gain amplifier and digital to analog converter；
Damping resistance is connected between the outfan of buffer circuit and the input of variable gain amplifier；
Buffer circuit receives input signal, and its outfan is connected with damping resistance.Buffer circuit improves variable-gain amplification circuit
Input resistance, convenient input, output resistance Matching and modification simultaneously.
The input of variable gain amplifier is connected with damping resistance, and it controls end and is connected with digital to analog converter.Variable increasing
The reference voltage that the gain of benefit amplifier is exported by digital to analog converter and control Control of Voltage；
The reference voltage of digital to analog converter is connected to the gain control negative terminal of variable gain amplifier, the analog voltage of digital-to-analogue conversion
Outfan is connected to the gain control anode of variable gain amplifier.Digital to analog converter receives the Data Control letter of external system
Number, and it is converted into analog voltage, it is achieved gain control.
Buffer circuit includes operational amplifier, the first electric capacity, the second electric capacity and adjustable resistance；
The in-phase input end being input to operational amplifier signal to be amplified, adjustable resistance be connected on operational amplifier in-phase input end and
Between ground, the first electric capacity is connected between the positive supply of operational amplifier and ground, and the second electric capacity is connected on the negative supply of operational amplifier
And between ground；The inverting input of operational amplifier and outfan short circuit.
The outfan of one termination operational amplifier of damping resistance, the homophase input of another termination variable gain amplifier
End.
The in-phase input end of variable gain amplifier connects damping resistance, the anti-phase input termination of variable gain amplifier
Ground；It is connected the 3rd electric capacity between gain control anode and the ground of variable gain amplifier；The gain control of variable gain amplifier
The 4th electric capacity it is connected between negative terminal with ground；The 5th electric capacity it is connected between the positive supply of variable gain amplifier and ground；Variable gain
The 6th electric capacity it is connected between the negative supply of amplifier and ground；Signal after the outfan output amplification of variable gain amplifier.
The gain control anode of variable gain amplifier is connected to digital to analog converter analog voltage outfan, and variable gain is put
The gain control negative terminal of big device is connected to the reference voltage output terminal of digital to analog converter.
The power supply termination power of digital to analog converter；The 7th electric capacity it is connected between the power end of digital to analog converter and ground；Digital-to-analogue
The reference voltage output terminal of transducer connects the gain control negative terminal of variable gain amplifier, and the analog voltage of digital to analog converter is defeated
Go out end and connect the gain control anode of variable gain amplifier；The earth terminal ground connection of digital to analog converter.
The digital quantity input port of digital to analog converter receives the gain control digital quantity that serial port sends.
The invention have the advantage that
Utilize the reference voltage and numerical control analog output voltage that digital to analog converter exports as variable-gain amplifier gain control
Voltage.After gain is determined, the gain of variable gain amplifier will not be caused because of power-supply fluctuation, drift and system noise etc.
Produce fluctuation or drift, it is ensured that the gain of amplifying circuit is the most controlled, it is to avoid because gain control instability is brought the most defeated
The amplitude fluctuation gone out and noise, beneficially system the most correctly judge the feature of input signal, it is simple to rear class controls.It addition, increase
Benefit control performer by band reference voltage export serial digital to analog converter realize, need not additionally increase device, it is simple to little
Typeization is integrated.
Accompanying drawing explanation
Fig. 1 is variable-gain amplification circuit block diagram of the present invention.
Fig. 2 is the input buffer circuit figure of variable-gain amplification circuit of the present invention.
Fig. 3 is damping resistance and the gain-changeable amplifier circuit figure of variable gain amplifier of the present invention.
Fig. 4 is the d convertor circuit figure of variable-gain amplification circuit of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawings, the embodiment of this programme is described in detail.
As shown in Figure 1, a kind of variable-gain amplification circuit with high stable gain control of the present invention, including buffer circuit
1, damping resistance 2, variable gain amplifier 3 and digital to analog converter 4.IN signal to be amplified is buffered and hinders by buffer circuit 1
Anti-rotation is changed, and its outfan is connected with damping resistance 2, and damping resistance 2 and variable gain amplifier 3 constitute main amplifying circuit, to slow
The output signal rushing circuit 1 carries out variable gain amplification.Weighted-voltage D/A converter 4 receives the data signal of system input and is converted into simulation
Voltage signal, digital to analog converter 4 also provides the reference voltage signal of high stable for variable gain amplifier 3 simultaneously.Variable gain
After amplifier 3 receives reference voltage signal and the analog voltage control signal of digital to analog converter 4 output, carry out high stable gain
Adjust and control.After once gain control signal is set up, the gain of variable gain amplifier 3 will not be because of mains fluctuations or skew
There is gain fluctuation or drift, also gain will be made to fluctuate because of system noise impact, the abnormal phenomena such as saltus step.
The structure of buffer circuit in the present invention is described in conjunction with Fig. 2.Buffer circuit is by operational amplifier N1, electric capacity C1, electricity
Hold C2 and adjustable resistance R1 to constitute.IN signal to be amplified is input to the 3 foot in-phase input ends of operational amplifier N1, adjustable resistance R1
Be connected between operational amplifier 3 foot in-phase input end and ground GND, electric capacity C1 be connected on the 7 foot positive supply VCC of operational amplifier N1 with
Between ground GND, electric capacity C2 is connected between the 4 foot negative supply VEE of operational amplifier N1 and ground GND.2 feet of operational amplifier N1 are anti-
Phase input and 6 foot outfan short circuits, form typical buffer circuit.
In conjunction with Fig. 3, the damping resistance 2 in the present invention and the circuit of variable gain amplifier 3 are described.Damping resistance 2 is resistance
R2.The outfan of buffer circuit 1 is connected to damping resistance 2(i.e. resistance R2), damping resistance 2(i.e. resistance R2) another termination can
The 3 foot in-phase input ends of variable-gain amplifier N2, the 4 foot reverse inter-input-ing ending grounding GND of variable gain amplifier N2, electric capacity C3 connects
Between the 1 foot gain control anode Vc and ground GND of variable gain amplifier N2, electric capacity C4 is connected on variable gain amplifier N2's
Between 2 foot control negative terminal Vref and ground GND, electric capacity C5 be connected on the 8 foot positive supply VCC of variable gain amplifier N2 and ground GND it
Between, electric capacity C6 is connected between the 6 foot negative supply VEE of variable gain amplifier N2 and ground GND, 7 feet of variable gain amplifier N2
Signal after outfan OUT output amplification.The 1 foot gain control anode Vc of variable gain amplifier N2 receives digital-to-analogue in Fig. 4 and turns
The 2 foot gain control negative terminal Vref of parallel operation 4 foot analog voltage outfan VOUT, variable gain amplifier N2 receive digital-to-analogue in Fig. 4
Transducer 2 foot reference voltage output terminal Vrefout.
Digital to analog converter in the present invention is described in conjunction with Fig. 4.The 1 foot power end VDD of digital to analog converter N3 meets power supply VCC,
Electric capacity C7 is connected between the 1 foot power end VDD of digital to analog converter N3 and ground GND, the 2 foot reference voltage outputs of digital to analog converter N3
The 2 foot gain control negative terminal Vref of variable gain amplifier N2, the 3 foot feedback ends of digital to analog converter N3 in end Vrefout map interlinking 4
VFB and 4 foot analog voltage outfan VOUT is connected, variable increasing in 4 foot analog voltage outfan VOUT map interlinkings 4 of digital to analog converter
The 1 foot gain control anode Vc of benefit amplifier N2.8 foot earth terminal GND ground connection of digital to analog converter.The 5 of digital to analog converter, 6,7
Foot, SCLK, DIN be digital quantity input port, receive system serial port send gain control digital quantity.
The digital quantity received is converted into magnitude of voltage by digital to analog converter, controls the gain of variable gain amplifier N2.?
After receiving gain control digital quantity, the reference voltage that the gain of variable gain amplifier N2 is only exported by analog converter N3V refAnd analog voltageV cDetermine, and the reference voltage of digital to analog converter N3 outputV refAnd analog voltageV cThere is high stability, low
Temperature drift, low-noise characteristic, will not change because of impacts such as the fluctuation of supply voltage, drift and ground noises.
If the change in gain speed of voltage-controlled variable gain amplifier is 1dB/0.025V, gain-controlled voltage difference allowed band
Changing to 0.5V for-0.5V, gain is transformed to 40dB by 0dB, then its gainGControl is:
G =(V c-V ref+ 0.5)/0.025, unit is dB.
The invention have the advantages that 1) buffer circuit makes amplifying circuit be adapted to front stage circuits with high impedance output even
Connect, impedance matching can be interconnected and adjust；2) damping resistance can improve the input impedance of variable gain amplifier, simultaneously with can
The inside input resistance of variable-gain amplifier constitutes attenuation network, it is achieved the gain-variable scope of variable gain amplifier adjusts；
3) output of digital to analog converter reference voltage and analog voltage output together decide on the gain of controllable gain amplifier, digital to analog converter
The high stability of output determines that gain control has high stability.Avoid because of power-supply fluctuation, drift and ground bounce noise etc.
Impact, cause the output pulsation of amplifying circuit, noise increase and gain control concordance difference etc. problem.
Claims (7)
1. there is a variable-gain amplification circuit for high stable gain control, it is characterized in that, adjustable slow including input resistance
Rush circuit, damping resistance, variable gain amplifier and digital to analog converter；
Damping resistance is connected between the outfan of buffer circuit and the input of variable gain amplifier；
Buffer circuit receives input signal, and outfan is connected with damping resistance；
The input of variable gain amplifier is connected with damping resistance, controls end and is connected with digital to analog converter；Variable gain is amplified
The reference voltage that the gain of device is exported by digital to analog converter and control Control of Voltage；
The reference voltage of digital to analog converter output is connected to the gain control negative terminal of variable gain amplifier, the simulation of digital-to-analogue conversion
Voltage output end is connected to the gain control anode of variable gain amplifier；Digital to analog converter receives the Data Control of external system
Signal, and it is converted into analog voltage, it is achieved gain control.
The variable-gain amplification circuit with high stable gain control the most according to claim 1, is characterized in that, buffering electricity
Road includes operational amplifier, the first electric capacity, the second electric capacity and adjustable resistance；
The in-phase input end being input to operational amplifier signal to be amplified, adjustable resistance be connected on operational amplifier in-phase input end and
Between ground, the first electric capacity is connected between the positive supply of operational amplifier and ground, and the second electric capacity is connected on the negative supply of operational amplifier
And between ground；The inverting input of operational amplifier and outfan short circuit.
The variable-gain amplification circuit with high stable gain control the most according to claim 2, is characterized in that, decay electricity
The outfan of one termination operational amplifier of resistance, the in-phase input end of another termination variable gain amplifier.
The variable-gain amplification circuit with high stable gain control the most according to claim 1, is characterized in that, variable increasing
The in-phase input end of benefit amplifier connects damping resistance, the reverse inter-input-ing ending grounding of variable gain amplifier；Variable gain is amplified
It is connected the 3rd electric capacity between gain control anode and the ground of device；It is connected between gain control negative terminal and the ground of variable gain amplifier
4th electric capacity；The 5th electric capacity it is connected between the positive supply of variable gain amplifier and ground；The negative supply of variable gain amplifier with
The 6th electric capacity is connected between ground；Signal after the outfan output amplification of variable gain amplifier.
The variable-gain amplification circuit with high stable gain control the most according to claim 1, is characterized in that, variable increasing
The gain control anode of benefit amplifier is connected to digital to analog converter analog voltage outfan, the gain control of variable gain amplifier
Negative terminal is connected to the reference voltage output terminal of digital to analog converter.
The variable-gain amplification circuit with high stable gain control the most according to claim 1, is characterized in that, digital-to-analogue turns
The power supply termination power of parallel operation；The 7th electric capacity it is connected between the power end of digital to analog converter and ground；The reference electricity of digital to analog converter
Pressure outfan connects the gain control negative terminal of variable gain amplifier, and the analog voltage outfan of digital to analog converter connects variable increasing
The gain control anode of benefit amplifier；The earth terminal ground connection of digital to analog converter.
The variable-gain amplification circuit with high stable gain control the most according to claim 6, is characterized in that, digital-to-analogue turns
The digital quantity input port of parallel operation receives the gain control digital quantity that serial port sends.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610634065.0A CN106067773B (en) | 2016-08-05 | 2016-08-05 | A kind of variable-gain amplification circuit with high stable gain control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610634065.0A CN106067773B (en) | 2016-08-05 | 2016-08-05 | A kind of variable-gain amplification circuit with high stable gain control |
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| Publication Number | Publication Date |
|---|---|
| CN106067773A true CN106067773A (en) | 2016-11-02 |
| CN106067773B CN106067773B (en) | 2018-06-29 |
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| CN201610634065.0A Active CN106067773B (en) | 2016-08-05 | 2016-08-05 | A kind of variable-gain amplification circuit with high stable gain control |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110048684A (en) * | 2019-03-12 | 2019-07-23 | 广州智慧城市发展研究院 | A kind of variable-gain amplification circuit and its implementation of automatic adjustment |
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2016
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| US20070064502A1 (en) * | 2005-09-16 | 2007-03-22 | Chih-Jen Yen | Digital-to-analog conversion device |
| US20100045371A1 (en) * | 2007-02-08 | 2010-02-25 | Advantest Corporation | Amplification control device, test signal generation module, test device, amplification control method, program, and recording medium |
| US20090102555A1 (en) * | 2007-10-23 | 2009-04-23 | Blum Gregory A | Automatic gain Control (AGC) with lock detection |
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| CN102868369A (en) * | 2011-07-05 | 2013-01-09 | 杭州中科微电子有限公司 | Radio frequency automatic gain control amplifier |
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| CN110048684A (en) * | 2019-03-12 | 2019-07-23 | 广州智慧城市发展研究院 | A kind of variable-gain amplification circuit and its implementation of automatic adjustment |
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| CN106067773B (en) | 2018-06-29 |
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Address after: 233040 No.10 Caiyuan Road, Bengbu City, Anhui Province Patentee after: Anhui North Microelectronics Research Institute Group Co.,Ltd. Address before: 233040 No.10 Caiyuan Road, Bengbu City, Anhui Province Patentee before: NORTH ELECTRON RESEARCH INSTITUTE ANHUI Co.,Ltd. |
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Address after: 233040 No.10 Caiyuan Road, Bengbu City, Anhui Province Patentee after: Anhui North Microelectronics Research Institute Group Co.,Ltd. Address before: 233040 No.10 Caiyuan Road, Bengbu City, Anhui Province Patentee before: Anhui North Microelectronics Research Institute Group Co.,Ltd. |
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