CN204681321U - A kind of programmable amplifying circuit - Google Patents
A kind of programmable amplifying circuit Download PDFInfo
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- CN204681321U CN204681321U CN201520323481.XU CN201520323481U CN204681321U CN 204681321 U CN204681321 U CN 204681321U CN 201520323481 U CN201520323481 U CN 201520323481U CN 204681321 U CN204681321 U CN 204681321U
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Abstract
The utility model discloses a kind of programmable amplifying circuit, comprise the controller U1, D/A converter U2, voltage reduction module, voltage-controlled amplifier U3 and the fixed gain amplification module that connect successively; The utility model exports by controlling high-precision d/a converter the gain that accurate control voltage controls voltage-controlled amplifier, gain and the control voltage linear relationship of the voltage-controlled amplifier that the utility model adopts are good, advantages such as carrying out correction matching without the need to gathering mass data, the utility model has that precision is high, gain control range is large, bandwidth, response are fast, easy to use.
Description
Technical field
The utility model relates to a kind of circuit, is specifically related to a kind of programmable amplifying circuit.
Background technology
Current, along with the development of digitizing technique, all kinds of measuring instrument is more and more tending towards to digitlization and intelligentized future development.These equipment are generally made up of the data processing circuit of the transducer of front end, amplifier circuit and rear end.Wherein Back end data treatment circuit adopts high-precision A/D and high-speed microprocessor usually, to ensure precision and the rate request of instrument.For front-end circuit, due to the amplitude of sensor output signal and driving force all fainter, must the high-precision measuring amplifier of adjunction to meet the requirement of back-end circuit; On the other hand, the amplitude of transducer output signal in difference test may be mutually far short of what is expected, traditional processing method increases manual gear to amplifier to regulate the signal of the A/D Gather and input end to ensure rear end in certain amplitude, thus ensure the certainty of measurement of whole instrument.Artificial gear regulates and adds the complexity of instrument operation, have impact on the real-time of DATA REASONING, and gear regulates the unreliability and contact resistance that usually adopt machinery to turn to turn round and add instrument on the impact of certainty of measurement simultaneously.
Therefore, be necessary very much to design a kind of programmable amplifying circuit for above situation.It can adapt to the analog signal of wide variation automatically, and the size for measured signal carrys out the gain of resonance-amplifier, the analog signal of different amplitude is amplified to certain particular range to ensure that back-end circuit normally works.By the size of control amplifier gain, it is more convenient to use, thus makes the numerical value of systematic survey more accurate.
Traditional method adopts variable connector in conjunction with amplifier to realize programming amplifying, such as: be made up of variable connector and rp-op amp, is made up of variable connector and homophase operational amplifier, is made up of with differential amplifier variable connector, etc.But these some defects of scheme ubiquity: select gear less, contact resistance has a certain impact to certainty of measurement.
Utility model content
For the deficiency that prior art exists, the programmable amplifying circuit that the utility model provides that a kind of precision is high, gain control range is large, bandwidth, response are fast, easy to use.
The technical scheme that the utility model adopts is: a kind of programmable amplifying circuit, comprises the controller U1, D/A converter U2, voltage reduction module, voltage-controlled amplifier U3 and the fixed gain amplification module that connect successively.
Further, described circuit is by ± 5V Power supply.
Further, 1,2,3,4 pin of described D/A converter U2 are connected with 1,2,3,4 pin of controller U1 by data/address bus, and 6 pin and 8 pin of D/A converter U2 connect+5V power supply, 5 pin ground connection; The the firstth electric capacity C1 is connected between 5 described pin and 6 pin; Described voltage reduction module comprises the first resistance R1 and the second resistance R2,3 pin of voltage-controlled amplifier U3 are connect after 7 pin of described D/A converter U2 meet the first resistance R1, two tunnels are connected to respectively between 3 pin meeting voltage-controlled amplifier U3 after the first described resistance R1, one tunnel connects-5V power supply after meeting the second resistance R2, and another road connects ground connection after the second electric capacity C2; 1 pin of described voltage-controlled amplifier U3 connects input signal, 2 pin and 8 pin ground connection, and 4 pin skies connect, and 6 pin connect+5V power supply, and 7 pin connect-5V power supply, and 5 pin connect fixed gain amplification module after meeting the 3rd resistance R3; Described fixed gain amplification module comprises operational amplifier U4, the 4th resistance R4 and the 5th resistance R5,3 pin of the 3rd described resistance R3 concatenation operation amplifier U4,7 pin of described operational amplifier U4 connect+5V power supply, 4 pin connect-5V power supply, one end ground connection of the 4th described resistance R4,2 pin of other end concatenation operation amplifier U4 and one end of the 5th resistance R5,6 pin of the other end concatenation operation amplifier U4 of the 5th described resistance R5 and output signal end.
Preferably, described controller U1 adopts FPGA or dsp controller.
Preferably, described D/A converter U2 adopts model to be the D/A converter of TLV5616.
Preferably, described voltage-controlled amplifier U3 adopts model to be the voltage-controlled amplifier of VCA810.
Preferably, described operational amplifier U4 adopts model to be the operational amplifier of OPA659.
The beneficial effects of the utility model are: a kind of programmable amplifying circuit, the gain that accurate control voltage controls voltage-controlled amplifier is exported by controlling high-precision d/a converter, gain and the control voltage linear relationship of the voltage-controlled amplifier that the utility model adopts are good, advantages such as carrying out correction matching without the need to gathering mass data, the utility model has that precision is high, gain control range is large, bandwidth, response are fast, easy to use.
Accompanying drawing explanation
Fig. 1 is structured flowchart of the present utility model;
Fig. 2 is circuit theory diagrams of the present utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described further.
As Fig. 1, a kind of programmable amplifying circuit, comprises the controller U1, D/A converter U2, voltage reduction module, voltage-controlled amplifier U3 and the fixed gain amplification module that connect successively.
Described circuit is by ± 5V Power supply.
1,2,3,4 pin of described D/A converter U2 are connected with 1,2,3,4 pin of controller U1 by data/address bus, and 6 pin and 8 pin of D/A converter U2 connect+5V power supply, 5 pin ground connection; The first electric capacity C1 is connected between 5 described pin and 6 pin; Described voltage reduction module comprises the first resistance R1 and the second resistance R2,3 pin of voltage-controlled amplifier U3 are connect after 7 pin of described D/A converter U2 meet the first resistance R1, two tunnels are connected to respectively between 3 pin meeting voltage-controlled amplifier U3 after the first described resistance R1, one tunnel connects-5V power supply after meeting the second resistance R2, and another road connects ground connection after the second electric capacity C2; 1 pin of described voltage-controlled amplifier U3 connects input signal, 2 pin and 8 pin ground connection, and 4 pin skies connect, and 6 pin connect+5V power supply, and 7 pin connect-5V power supply, and 5 pin connect fixed gain amplification module after meeting the 3rd resistance R3; Described fixed gain amplification module comprises operational amplifier U4, the 4th resistance R4 and the 5th resistance R5,3 pin of the 3rd described resistance R3 concatenation operation amplifier U4,7 pin of described operational amplifier U4 connect+5V power supply, 4 pin connect-5V power supply, one end ground connection of the 4th described resistance R4,2 pin of other end concatenation operation amplifier U4 and one end of the 5th resistance R5,6 pin of the other end concatenation operation amplifier U4 of the 5th described resistance R5 and output signal end.
Described controller U1 adopts FPGA or dsp controller.
Described D/A converter U2 adopts model to be the D/A converter of TLV5616.
Described voltage-controlled amplifier U3 adopts model to be the voltage-controlled amplifier of VCA810.
Described operational amplifier U4 adopts model to be the operational amplifier of OPA659.
The utility model adopts D/A converter U2 and the defeated control voltage of decompression network, controls the multiplication factor of voltage-controlled amplifier U3, then exports through rear class fixed gain amplification module;
This programmable amplifying circuit exports by controlling 12 high accuracy TLV5616D/A transducer U2 the gain that accurate control voltage controls voltage-controlled amplifier U3, gain and the control voltage linear relationship of the VCA810 voltage-controlled amplifier U3 adopted are good, correction matching is carried out without the need to gathering mass data, therefore the utility model precision is high, easy to use, and gain control range can reach-20dB ~+60dB.In addition, the VCA810 voltage-controlled amplifier U3 gain bandwidth product adopted due to this programmable amplifying circuit reaches 35MHz, the fixed gain amplification module of rear class adopts OPA659 operational amplifier U4, and its gain bandwidth product is especially up to 350MHz, therefore utility model works frequency band is very wide.
See Fig. 2, circuit employing ± 5V powers, and 1,2,3,4 pin of the TLV5616D/A transducer U2 in circuit are connected with controller U1, and this controller U1 can be FPGA, DSP or other controllers.After TLV5616D/A transducer U2 powers, for it provides the reference voltage an of+5V, then the scope of its output voltage V1 can reach 0V ~+5V, by controller U1 control V1 scope within 1V ~ 5V.Output voltage V1 by being connected to the control voltage pin Vc of VCA810 voltage-controlled amplifier U3 after voltage reduction module, i.e. No. 3 pins.Voltage reduction module is made up of resistance R1, R2 and-5V, and wherein the concrete resistance of resistance R1, R2 is not limit, and only need meet:
R1＝R2
, then control voltage:
Scope be-2V ~ 0V, simultaneously 3 pin of VCA810 voltage-controlled amplifier U3 are connected in series ground connection decoupling after the second electric capacity C2, play the effect of stable voltage control.The input signal of whole programmable amplifying circuit inputs from 1 pin of VCA810 voltage-controlled amplifier U3, after power supply, and the actual gain of VCA810 voltage-controlled amplifier U3
G
(dB)＝-40·(Vc+1)dB
Scope be-40dB ~+40dB.Be connected to the input of rear class fixed gain amplifier after 5 pin serial connection the 3rd resistance R3 of VCA810 voltage-controlled amplifier U3, wherein the concrete resistance of the 4th resistance R4, the 5th resistance R5 is not limit, and only need meet:
R5＝9R4
, then the multiplication factor of rear class fixed gain amplification module is:
Namely fixed gain is that output 6 pin of 20dB, OPA659 operational amplifier U4 is final output.Therefore, the gain controllable scope of whole programmable amplifying circuit is-20dB ~+60dB, realizes programming amplifying by the output voltage of controller U1 control TLV5616D/A transducer U2.The concrete control realization of the utility model is prior art, and the utility model is generator structure-design technique scheme only.
Claims (7)
1. a programmable amplifying circuit, is characterized in that: comprise the controller U1, D/A converter U2, voltage reduction module, voltage-controlled amplifier U3 and the fixed gain amplification module that connect successively.
2. a kind of programmable amplifying circuit according to claim 1, is characterized in that: described circuit is by ± 5V Power supply.
3. a kind of programmable amplifying circuit according to claim 1, it is characterized in that: 1,2,3,4 pin of described D/A converter U2 are connected with 1,2,3,4 pin of controller U1 by data/address bus, 6 pin and 8 pin of D/A converter U2 connect+5V power supply, 5 pin ground connection; The first electric capacity C1 is connected between 5 described pin and 6 pin; Described voltage reduction module comprises the first resistance R1 and the second resistance R2,3 pin of voltage-controlled amplifier U3 are connect after 7 pin of described D/A converter U2 meet the first resistance R1, two tunnels are connected to respectively between 3 pin meeting voltage-controlled amplifier U3 after the first described resistance R1, one tunnel connects-5V power supply after meeting the second resistance R2, and another road connects ground connection after the second electric capacity C2; 1 pin of described voltage-controlled amplifier U3 connects input signal, 2 pin and 8 pin ground connection, and 4 pin skies connect, and 6 pin connect+5V power supply, and 7 pin connect-5V power supply, and 5 pin connect fixed gain amplification module after meeting the 3rd resistance R3; Described fixed gain amplification module comprises operational amplifier U4, the 4th resistance R4 and the 5th resistance R5,3 pin of the 3rd described resistance R3 concatenation operation amplifier U4,7 pin of described operational amplifier U4 connect+5V power supply, 4 pin connect-5V power supply, one end ground connection of the 4th described resistance R4,2 pin of other end concatenation operation amplifier U4 and one end of the 5th resistance R5,6 pin of the other end concatenation operation amplifier U4 of the 5th described resistance R5 and output signal end.
4. a kind of programmable amplifying circuit according to claim 1, is characterized in that: described controller U1 adopts FPGA or dsp controller.
5. a kind of programmable amplifying circuit according to claim 1, is characterized in that: described D/A converter U2 adopts model to be the D/A converter of TLV5616.
6. a kind of programmable amplifying circuit according to claim 1, is characterized in that: described voltage-controlled amplifier U3 adopts model to be the voltage-controlled amplifier of VCA810.
7. a kind of programmable amplifying circuit according to claim 3, is characterized in that: described operational amplifier U4 adopts model to be the operational amplifier of OPA659.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520323481.XU CN204681321U (en) | 2015-05-19 | 2015-05-19 | A kind of programmable amplifying circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520323481.XU CN204681321U (en) | 2015-05-19 | 2015-05-19 | A kind of programmable amplifying circuit |
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| Publication Number | Publication Date |
|---|---|
| CN204681321U true CN204681321U (en) | 2015-09-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520323481.XU Expired - Fee Related CN204681321U (en) | 2015-05-19 | 2015-05-19 | A kind of programmable amplifying circuit |
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| Country | Link |
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| CN (1) | CN204681321U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106067773A (en) * | 2016-08-05 | 2016-11-02 | 北方电子研究院安徽有限公司 | A kind of variable-gain amplification circuit with high stable gain control |
-
2015
- 2015-05-19 CN CN201520323481.XU patent/CN204681321U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106067773A (en) * | 2016-08-05 | 2016-11-02 | 北方电子研究院安徽有限公司 | A kind of variable-gain amplification circuit with high stable gain control |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150930 Termination date: 20160519 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |