CN203416227U - Small signal amplification circuit - Google Patents
Small signal amplification circuit Download PDFInfo
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- CN203416227U CN203416227U CN201320461944.XU CN201320461944U CN203416227U CN 203416227 U CN203416227 U CN 203416227U CN 201320461944 U CN201320461944 U CN 201320461944U CN 203416227 U CN203416227 U CN 203416227U
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- circuit
- amplification circuit
- small signal
- zero
- amplifying circuit
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Abstract
The utility model discloses a small signal amplification circuit which comprises an amplification circuit, a zero correction circuit and a low-pass filter circuit, wherein the amplification circuit is used for carrying out noise suppression and amplification treatment on an input differential voltage signal; the zero correction circuit is used for providing zero correction so as to ensure that the output voltage of the amplification circuit is zero when the input differential voltage signal is zero; the output end of the zero correction circuit is connected with the amplification circuit; the low-pass filter circuit is connected with the output end of the amplification circuit. The small signal amplification circuit has the characteristics of high common mode rejection ratio, high input impedance, low noise, low linear error, low imbalance drifting and the like, small signal amplification and noise suppression are accomplished through an instrument amplifier and a peripheral circuit thereof, and stable and reliable analog signals can be provided for later data acquisition. The small signal amplification circuit further has the advantages that the circuit structure is simple and the operation is easy to implement.
Description
Technical field
The utility model relates to a kind of amplifying circuit, especially relates to a kind ofly can amplifying and disturbing to external world the small signal amplification circuit that effective inhibition is provided measured signal.
Background technology
During moving the or electronic control compression device compressing of digital galactophore tractor driver mammary gland, the oppressive force that press discs is born needs to detect in real time, and its oppressive force of bearing must be guaranteed within a certain threshold value, when surpassing this threshold value, its suffered oppressive force can not be increasing, to guarantee mammary gland patient mammary gland safety.
Digital galactophore machine adopts pressure sensor feeds back oppressive force that press discs is born, and tested oppressive force direct proportion is in pressure sensor output signal.Larger oppressive force acts on press discs, the voltage signal that pressure sensor output is larger, and larger voltage signal is detected and measurement easily; Less oppressive force acts on press discs, and pressure sensor is exported little voltage signal.The pressure sensor adopting due to digital galactophore machine has the features such as high accuracy, sensitivity, when manual or electronic control compression device imposes on the little oppressive force of one of mammary gland, and the voltage signal that is very easily subject to external interference that pressure sensor output is little.Therefore, how to guarantee that the little voltage signal of pressure sensor output is easily detected and is not subject to external interference, become one of technical barrier of current continuation solution.
Be illustrated in figure 1 the schematic diagram of existing a kind of cascade in-phase amplification circuit amplifying for small-signal.
General amplifier is all direct-coupling or the resistance-capacitance coupled amplifier that utilizes parametric compensation principle, direct coupled amplifier has also amplified temperature and has floated when amplifying useful direct current signal, although float and resistance-capacitance coupled amplifier can suppress temperature, but can not be used for amplifying faint direct current signal or the slow signal changing, and in small signal amplification circuit, the noise being brought by amplifier is also inevitable.
Utility model content
The utility model proposes and a kind ofly can amplify and can disturb to external world the small signal amplification circuit that effective inhibition is provided measured signal, with better simply analog circuit, realize the amplification of pressure sensor output small-signal, and noise, temperature are floated etc. to interference effective inhibition is provided.
The utility model adopts following technical scheme to realize: a kind of small signal amplification circuit, and it comprises: for the differential voltage signal of input being carried out to noise suppressed and amplifying the amplifying circuit of processing; The output voltage that amplifying circuit when the differential voltage signal of input is zero is provided for providing zero correction take is also zero zero correction circuit, and the output of this zero correction circuit connects amplifying circuit; Be connected to the low-pass filter circuit of amplification circuit output end.
Wherein, amplifying circuit comprises one-level amplifying circuit and the second amplifying circuit of cascade.
Wherein, one-level amplifying circuit and second amplifying circuit are all comprised of instrument amplifier and peripheral circuit.
Wherein, zero correction circuit comprises the operational amplifier U1 of output reference voltage, and the resistance R 4, variable resistor VR2 and the resistance R 3 that are connected in series successively, and the tap of variable resistor VR2 couples the negative input end of instrument amplifier U3 in second amplifying circuit.
Wherein, low-pass filter circuit comprises operational amplifier U2, is connected to the Order RC active filter circuit between the output of instrument amplifier U3 in second amplifying circuit and the positive input terminal of operational amplifier U2.
Compared with prior art, the utlity model has following beneficial effect:
The utlity model has the features such as high cmrr, high input impedance, low noise, low linearity error, low offset drift, adopt instrument amplifier and peripheral circuit thereof to complete small-signal and amplify and noise suppressed, can be follow-up data collection stable, reliable analog signal is provided.The utility model also have circuit structure simple, realize and be easy to advantage.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of existing a kind of cascade in-phase amplification circuit amplifying for small-signal.
Fig. 2 is the structural representation of small signal amplification circuit of the present utility model.
Fig. 3 is partial circuit schematic diagram of the present utility model.
Embodiment
As shown in Figure 2, the small signal amplification circuit the utility model proposes comprises: power module; The one-level amplifying circuit, second amplifying circuit and the low-pass filter circuit that connect successively, and the zero correction circuit that connects second amplifying circuit.Power module connects and provides reliable and stable voltage for one-level amplifying circuit, second amplifying circuit, low-pass filter circuit and zero correction circuit.
Pressure sensor, as the signal converter part of pressure, converts differential voltage signal to force value.One-level amplifying circuit is comprised of instrument amplifier and peripheral circuit, and the differential signal of pressure sensor output is carried out preposition amplification and noise is effectively suppressed; Second amplifying circuit is also comprised of instrument amplifier and peripheral circuit, the output signal of one-level amplifying circuit is done further to amplify, and multiplication factor is adjustable, to meet follow-up data, gathers demand; Low-pass filter circuit only allows the signal of assigned frequency section to pass through, and the signal of all the other frequency bands is suppressed; Zero correction circuit provides zero correction function, and to guarantee that pressure sensor does not have signal when output, whole amplifying circuit output voltage is zero.The output signal of low-pass filter circuit send AD module to carry out analog-to-digital conversion, converts rear MCU microprocessor and just can carry out Digital Signal Processing.
Be illustrated in figure 3 the schematic diagram of second amplifying circuit in Fig. 2, zero correction circuit and low-pass filter circuit.Second amplifying circuit and zero correction circuit are to be realized by instrument amplifier U3 and peripheral circuit thereof.Operational amplifier U1 output-2.5V reference voltage, the devices such as operational amplifier U1 and resistance R 4, variable resistor VR2, resistance R 3 form zero correction circuit.When press discs does not suffer oppression power, if pressure sensor output signal is non-vanishing, through one-level amplifying circuit, amplify, its output signal VI is also not equal to zero, by regulating the resistance of adjustable resistance VR2 on zero correction circuit, make voltage V1 on the negative input end of instrument amplifier U3 equal VI, the second amplifying circuit forming through devices such as instrument amplifier U3, output voltage V 2 also just equals zero, and zero correction function has just realized.Signal V2 forms Order RC active filter circuit filtering interfering through operational amplifier U2 and resistance R 12, resistance R 11, capacitor C 1 and capacitor C 2, just can provide stable, reliable analog signal to follow-up data collection.
Claims (5)
1. a small signal amplification circuit, is characterized in that, comprising: for the differential voltage signal of input being carried out to noise suppressed and amplifying the amplifying circuit of processing; The output voltage that amplifying circuit when the differential voltage signal of input is zero is provided for providing zero correction take is also zero zero correction circuit, and the output of this zero correction circuit connects amplifying circuit; Be connected to the low-pass filter circuit of amplification circuit output end.
2. a kind of small signal amplification circuit according to claim 1, is characterized in that, amplifying circuit comprises one-level amplifying circuit and the second amplifying circuit of cascade.
3. a kind of small signal amplification circuit according to claim 2, is characterized in that, one-level amplifying circuit and second amplifying circuit are all comprised of instrument amplifier and peripheral circuit.
4. a kind of small signal amplification circuit according to claim 3, it is characterized in that, zero correction circuit comprises the operational amplifier U1 of output reference voltage, and the resistance R 4, variable resistor VR2 and the resistance R 3 that are connected in series successively, the tap of variable resistor VR2 couples the negative input end of instrument amplifier U3 in second amplifying circuit.
5. a kind of small signal amplification circuit according to claim 4, it is characterized in that, low-pass filter circuit comprises operational amplifier U2, is connected to the Order RC active filter circuit between the output of instrument amplifier U3 in second amplifying circuit and the positive input terminal of operational amplifier U2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320461944.XU CN203416227U (en) | 2013-07-31 | 2013-07-31 | Small signal amplification circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320461944.XU CN203416227U (en) | 2013-07-31 | 2013-07-31 | Small signal amplification circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203416227U true CN203416227U (en) | 2014-01-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320461944.XU Expired - Lifetime CN203416227U (en) | 2013-07-31 | 2013-07-31 | Small signal amplification circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN203416227U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106018865A (en) * | 2016-07-08 | 2016-10-12 | 北京天际翔达科技有限公司 | Fully differential signal conditioning circuit for current excitation sensors |
| CN106093822A (en) * | 2016-07-11 | 2016-11-09 | 深圳市知用电子有限公司 | A kind of differential voltage probe automatic zero circuit |
| CN106645908A (en) * | 2016-12-08 | 2017-05-10 | 中国北方发动机研究所(天津) | High common mode small signal acquisition method and acquisition circuit |
| CN108566170A (en) * | 2018-04-14 | 2018-09-21 | 芜湖拓达电子科技有限公司 | A kind of operation amplifier circuit |
-
2013
- 2013-07-31 CN CN201320461944.XU patent/CN203416227U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106018865A (en) * | 2016-07-08 | 2016-10-12 | 北京天际翔达科技有限公司 | Fully differential signal conditioning circuit for current excitation sensors |
| CN106018865B (en) * | 2016-07-08 | 2018-12-21 | 北京天际翔达科技有限公司 | Fully differential signal conditioning circuit applied to current excitation sensor |
| CN106093822A (en) * | 2016-07-11 | 2016-11-09 | 深圳市知用电子有限公司 | A kind of differential voltage probe automatic zero circuit |
| CN106645908A (en) * | 2016-12-08 | 2017-05-10 | 中国北方发动机研究所(天津) | High common mode small signal acquisition method and acquisition circuit |
| CN106645908B (en) * | 2016-12-08 | 2019-04-05 | 中国北方发动机研究所(天津) | A kind of acquisition method and Acquisition Circuit of the small signal of high common mode |
| CN108566170A (en) * | 2018-04-14 | 2018-09-21 | 芜湖拓达电子科技有限公司 | A kind of operation amplifier circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20151204 Address after: 518000, Guangdong, Shiyan City, Shenzhen province Baoan District Stone Street neighborhood committee, brick village, Liyuan Industrial Zone, hung long hi tech Industrial Park (blue rhyme Industrial Park), 2, 1 floor Patentee after: SHENZHEN LANYUN MEDICAL IMAGE CO.,LTD. Address before: 518000 blue rhyme Science Park, Shiyan Avenue, Shiyan City, Guangdong, Shenzhen, Baoan District Patentee before: SHENZHEN LANDWIND INDUSTRY Co.,Ltd. |
|
| CP03 | Change of name, title or address |
Address after: No.103, baguang District Service Center, No.2 BaiShaWan Road, baguang community, Kuiyong street, Dapeng New District, Shenzhen, Guangdong 518000 Patentee after: Shenzhen Lanying Medical Technology Co.,Ltd. Address before: 518000 Shenzhen, Baoan District, Guangdong Shiyan street, Lang Xin neighborhood committee, brick factory village, Liyuan Industrial Zone, hung lung hi tech Industrial Park (blue Yun Industrial Park), 1 1 buildings. Patentee before: SHENZHEN LANYUN MEDICAL IMAGE CO.,LTD. |
|
| CP03 | Change of name, title or address | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140129 |
|
| CX01 | Expiry of patent term |