CN112117975A - Self-zeroing device of preamplifier - Google Patents
Self-zeroing device of preamplifier Download PDFInfo
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- CN112117975A CN112117975A CN201910541163.3A CN201910541163A CN112117975A CN 112117975 A CN112117975 A CN 112117975A CN 201910541163 A CN201910541163 A CN 201910541163A CN 112117975 A CN112117975 A CN 112117975A
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- preamplifier
- operational amplifier
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- 230000003750 conditioning effect Effects 0.000 claims abstract description 10
- 230000003321 amplification Effects 0.000 claims description 12
- 239000003990 capacitor Substances 0.000 claims description 12
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 12
- 238000005481 NMR spectroscopy Methods 0.000 description 5
- 238000009434 installation Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/34—Negative-feedback-circuit arrangements with or without positive feedback
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/45—Differential amplifiers
- H03F3/45071—Differential amplifiers with semiconductor devices only
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Abstract
The invention aims to provide a self-zeroing device of a preamplifier, which comprises a photoelectric sensor, a preamplifier circuit, a signal conditioning circuit and a feedback correction circuit, wherein the photoelectric sensor outputs to the preamplifier circuit, the preamplifier circuit outputs to the signal conditioning circuit, and the feedback correction circuit is respectively connected with the input end and the output end of the preamplifier circuit. The invention has the advantage that the compensation of the circuit output zero position is realized through the dynamic adjustment of the circuit. The zero position of the preamplifier circuit is directly compensated, an intelligent chip and a complex algorithm are not needed, the circuit is simple, the compensation capability is strong, the performance index of the original preamplifier circuit is not reduced, and the compensation efficiency is high.
Description
Technical Field
The invention belongs to a preamplifier circuit, and particularly relates to a self-zeroing device of the preamplifier circuit.
Background
The pre-amplifying circuit is applied to the nuclear magnetic resonance gyroscope, and has the function of converting a weak current signal output by the nuclear magnetic resonance gyroscope into a voltage signal in direct proportion to the weak current signal and providing the voltage signal to the data processing circuit. The output signal of the nuclear magnetic resonance gyroscope is weak and only has microampere level or even smaller, so that the preamplifier circuit is required to have very high amplification factor of 10-6, and meanwhile, the preamplifier circuit is required to have higher noise suppression capability of-110 dB for better signal restoring characteristics.
The nuclear magnetic resonance gyroscope is a product for filling the domestic blank, and the volume is continuously developed towards miniaturization while the requirement of high-precision indexes is met, so that great difficulty is brought to the installation of the photoelectric detector. Because the circuit amplification factor is high, the installation error of the photoelectric detector can be amplified into a considerable static error, and the constant value deviation correspondingly compresses the measuring range of the preamplifier circuit, thereby influencing the normal work of the nuclear magnetic resonance gyroscope.
Aiming at the problem, the zero control of the preamplification circuit is designed in a targeted manner, and the output zero of the dynamic correction circuit in the working process of the circuit is realized.
Disclosure of Invention
The invention aims to provide a self-zeroing device of a preamplifier, which can realize the compensation of the output zero position of a circuit.
The invention is realized in such a way that the self-zeroing device of the preamplifier comprises a photoelectric sensor, a preamplifier circuit, a signal conditioning circuit and a feedback correction circuit, wherein the photoelectric sensor outputs to the preamplifier circuit, the preamplifier circuit outputs to the signal conditioning circuit, and the feedback correction circuit is respectively connected with the input end and the output end of the preamplifier circuit.
The feedback correction circuit comprises a resistor, a capacitor and an operational amplifier, wherein the resistor R1 is connected with the capacitor C1 and the negative electrode of the operational amplifier, the other end of the capacitor C1 is connected with the resistor R2 and the output end of the operational amplifier, and the positive electrode of the operational amplifier is grounded.
R1 is an input resistor, and takes out the dc offset output from the preamplifier.
The resistance of R1 is above 10 kilo-ohm.
The C1 acts as an integrating capacitor.
The C1 is selected from 4.7-10 microfarads
The selection of the operational amplifier selects the low-noise and precise operational amplifier
The operational amplifier is selected from OP27, OP77 or the like.
The invention has the advantage that the compensation of the circuit output zero position is realized through the dynamic adjustment of the circuit. The zero position of the preamplifier circuit is directly compensated, an intelligent chip and a complex algorithm are not needed, the circuit is simple, the compensation capability is strong, the performance index of the original preamplifier circuit is not reduced, and the compensation efficiency is high.
Drawings
FIG. 1 is a schematic diagram of a prior art preamplifier;
FIG. 2 is a schematic diagram of a self-zeroing apparatus of a preamplifier according to the present invention;
fig. 3 is a partial circuit diagram of the feedback correction circuit.
Detailed Description
The invention is described in detail below with reference to the following figures and specific embodiments:
the original preamplifier shown in fig. 1 is composed of a preamplifier circuit and a signal conditioning circuit, and since the output signal of the photoelectric sensor is very weak, the photoelectric sensor is usually installed together with the preamplifier. The signal conditioning circuit mainly aims at solving the problems of matching with a backward channel circuit and the like. Because the signal amplification factor of the preamplifier is high, the preamplifier is very sensitive to the output of the photoelectric sensor, and self-zeroing is not realized, when the photoelectric sensor causes small zero offset due to installation error, the output signal generates large error, and when the error is large, the effective range of signal output can be greatly compressed. In order to solve the problem of adjustment of output zero position, the debugging and the installation are frequently repeated, and the working efficiency is influenced.
As shown in figure 2, the self-zeroing device of a preamplifier is characterized in that a feedback correction circuit is added on the basis of the original preamplifier, the direct current deviation output by the preamplifier is taken out and forms a feedback correction quantity after passing through the feedback correction circuit, and the feedback correction quantity is injected into the input of the preamplifier.
The self-zeroing device for preamplifier includes photoelectric sensor, preamplifier circuit, signal conditioning circuit and feedback correcting circuit, in which the photoelectric sensor outputs to the preamplifier circuit, the preamplifier circuit outputs to the signal conditioning circuit, and the feedback correcting circuit is respectively connected with input end and output end of the preamplifier circuit.
The feedback correction circuit shown in fig. 3 comprises a resistor, a capacitor and an operational amplifier, wherein the resistor R1 is connected with the capacitor C1 and the negative electrode of the operational amplifier, the other end of the capacitor C1 is connected with the resistor R2 and the output end of the operational amplifier, and the positive electrode of the operational amplifier is grounded.
R1 is an input resistor, which is used to take out the dc offset output by the preamplifier circuit, and the value of the resistor is generally as large as possible, at least above 10 kilo-ohms, in order to prevent the sampling from having a large influence on the original output. The C1 functions as an integrating capacitor and is generally selected from 4.7-10 microfarads according to specific circuit conditions, and the operational amplifier is selected from a low-noise and precise operational amplifier such as OP27, OP77 or the like. A typical integrator is formed by the R1, the C1 and an operational amplifier, and the direct current deviation extraction of the output of the pre-amplification circuit is realized. The correction quantity is injected into the input end of the pre-amplification circuit through a resistor R2, so that the self-zeroing of the pre-amplification circuit is realized. The value of the injection resistor R2 is determined by experiments, and the specific value is related to the amplification factor of the pre-amplification circuit.
Claims (8)
1. A self-zeroing device of a preamplifier is characterized in that: the photoelectric sensor comprises a photoelectric sensor, a pre-amplification circuit, a signal conditioning circuit and a feedback correction circuit, wherein the photoelectric sensor outputs to the pre-amplification circuit, the pre-amplification circuit outputs to the signal conditioning circuit, and the feedback correction circuit is respectively connected with the input end and the output end of the pre-amplification circuit.
2. A self zeroing apparatus of a preamplifier, as claimed in claim 1, wherein: the feedback correction circuit comprises a resistor, a capacitor and an operational amplifier, wherein the resistor R1 is connected with the capacitor C1 and the negative electrode of the operational amplifier, the other end of the capacitor C1 is connected with the resistor R2 and the output end of the operational amplifier, and the positive electrode of the operational amplifier is grounded.
3. A self zeroing apparatus of a preamplifier, as claimed in claim 2, wherein: r1 is an input resistor, and takes out the dc offset output from the preamplifier.
4. A self zeroing apparatus of a preamplifier according to claim 3, wherein: the resistance of R1 is above 10 kilo-ohm.
5. A self zeroing apparatus of a preamplifier, as claimed in claim 2, wherein: the C1 acts as an integrating capacitor.
6. A self zeroing apparatus of a preamplifier, as claimed in claim 5, wherein: the C1 is selected between 4.7 microfarads and 10 microfarads.
7. A self zeroing apparatus of a preamplifier, as claimed in claim 2, wherein: the selection type of the operational amplifier selects a low-noise and precise operational amplifier.
8. A self zeroing apparatus of a preamplifier, as claimed in claim 7, wherein: the operational amplifier is selected from OP27, OP77 or the like.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910541163.3A CN112117975A (en) | 2019-06-21 | 2019-06-21 | Self-zeroing device of preamplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910541163.3A CN112117975A (en) | 2019-06-21 | 2019-06-21 | Self-zeroing device of preamplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112117975A true CN112117975A (en) | 2020-12-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910541163.3A Pending CN112117975A (en) | 2019-06-21 | 2019-06-21 | Self-zeroing device of preamplifier |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5371479A (en) * | 1994-03-22 | 1994-12-06 | The United States Of America As Represented By The Secretary Of The Navy | Pre-amplifier with multi-stage feedback |
| CN201173781Y (en) * | 2007-11-14 | 2008-12-31 | 贾世聪 | Gyroscopes signal processing circuits |
| CN104716912A (en) * | 2015-01-04 | 2015-06-17 | 中国科学院声学研究所 | Small-signal amplification system |
| CN105375894A (en) * | 2015-10-09 | 2016-03-02 | 中国船舶重工集团公司第七一〇研究所 | High-gain low-noise weak pulse current signal amplification circuit |
| CN106936396A (en) * | 2017-04-26 | 2017-07-07 | 成都万家健康管理股份有限公司 | A kind of modulate circuit of Vibration Signal in Frequency Domain |
| CN208608965U (en) * | 2018-07-17 | 2019-03-15 | 重庆建安仪器有限责任公司 | A kind of pre-amplification circuit |
-
2019
- 2019-06-21 CN CN201910541163.3A patent/CN112117975A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5371479A (en) * | 1994-03-22 | 1994-12-06 | The United States Of America As Represented By The Secretary Of The Navy | Pre-amplifier with multi-stage feedback |
| CN201173781Y (en) * | 2007-11-14 | 2008-12-31 | 贾世聪 | Gyroscopes signal processing circuits |
| CN104716912A (en) * | 2015-01-04 | 2015-06-17 | 中国科学院声学研究所 | Small-signal amplification system |
| CN105375894A (en) * | 2015-10-09 | 2016-03-02 | 中国船舶重工集团公司第七一〇研究所 | High-gain low-noise weak pulse current signal amplification circuit |
| CN106936396A (en) * | 2017-04-26 | 2017-07-07 | 成都万家健康管理股份有限公司 | A kind of modulate circuit of Vibration Signal in Frequency Domain |
| CN208608965U (en) * | 2018-07-17 | 2019-03-15 | 重庆建安仪器有限责任公司 | A kind of pre-amplification circuit |
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Application publication date: 20201222 |