CN109150123A - A kind of small-signal pre-amplification circuit of high-gain - Google Patents
A kind of small-signal pre-amplification circuit of high-gain Download PDFInfo
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- CN109150123A CN109150123A CN201811137722.6A CN201811137722A CN109150123A CN 109150123 A CN109150123 A CN 109150123A CN 201811137722 A CN201811137722 A CN 201811137722A CN 109150123 A CN109150123 A CN 109150123A
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- 238000003199 nucleic acid amplification method Methods 0.000 title claims abstract description 27
- 239000003990 capacitor Substances 0.000 claims description 5
- 230000005611 electricity Effects 0.000 claims description 5
- 238000004088 simulation Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000005622 photoelectricity Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
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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
- H03F3/68—Combinations of amplifiers, e.g. multi-channel amplifiers for stereophonics
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Abstract
本发明公开了一种高增益的微弱信号前置放大电路，包括信号输入端、跨阻放大器、二级放大器和调节反馈电路，所述信号输入端连接所述跨阻放大器的反相输入端，所述跨阻放大器的输出端连接所述二级放大器的同向输入端，所述调节反馈电路辅助两级放大。本发明电路具有较高的跨阻增益，低漂移，高稳定，强抗干扰，低噪声，有合适的通频带，并且在通频带内有较高的增益，线性度好，输出信号波形不失真，保证信号能够被有效地放大。
The invention discloses a high-gain weak signal preamplifier circuit, comprising a signal input end, a transimpedance amplifier, a secondary amplifier and an adjustment feedback circuit, wherein the signal input end is connected to the inverting input end of the transimpedance amplifier, The output end of the transimpedance amplifier is connected to the non-inverting input end of the two-stage amplifier, and the adjustment feedback circuit assists the two-stage amplification. The circuit of the invention has high transimpedance gain, low drift, high stability, strong anti-interference, low noise, suitable passband, high gain in the passband, good linearity, and no distortion of the output signal waveform. , to ensure that the signal can be effectively amplified.
Description
Technical field
The present invention relates to the amplifying circuit of small-signal, the small-signal pre-amplification circuit of especially a kind of high-gain.
Background technique
The detection of small-signal needs more sensitive and accurate sensor, and is analyzed after detecting small-signal
Need first to amplify signal, thus be typically used in practical applications signal that various types of amplifiers obtain sensor into
Row amplification, but the element of the type selecting of amplifier and amplifying circuit often influences signal-to-noise ratio, sensitivity and the precision of final output
Etc. data.
In low-frequency weak signal detection field, it is former that China Seismology Bureau's geophysical exploration center is based on magnetic flux negative-feedback
Reason have developed it is a be applied to inductosyn low noise copped wave preamplifier, the defeated of induction coil can be effectively inhibited
Noise out makes induction coil resonance frequency two sides have flat amplitude-versus-frequency curve, has widened the response of inductosyn
Frequency band, China University of Geosciences's geophysics and spatial information institute devise a kind of suitable for the extraction of magnetic survey sensor signal
Amplifier, realize frequency-division section filtering, peak value can be that μ V level signal is put in 2kHz~4.5kHz frequency range by frequency-selecting amplification
Big to arrive volt rank, signal-to-noise ratio is greater than 20dB；The passband of above-mentioned technical proposal is relatively narrow, and noise suppressed is ideal not enough, therefore needs
Further to develop that gain is more preferable, noise is lower, the broader weak signal amplification circuit of frequency band.
Summary of the invention
To solve the above problems, the present invention based on trans-impedance amplifier and broad band amplifier, designs feedback circuit
Achieve the effect that low drifting, high stable, strong anti-interference, low noise, the high-gain in passband.
Technical solution used by the present invention solves the problems, such as it is:
A kind of small-signal pre-amplification circuit of high-gain, signal input part, trans-impedance amplifier including small-signal,
Two-stage amplifier, signal output end, feedback resistance R5, compensation resistance R6, compensating electric capacity C2 and capacitance C3, the signal are defeated
Enter the inverting input terminal that end connects the trans-impedance amplifier, the output end of the trans-impedance amplifier connects the two-stage amplifier
Noninverting input, the capacitance C3 and compensation both resistance R6 are coupled in parallel to the output end of the trans-impedance amplifier and anti-
Phase input terminal, the compensating electric capacity C2 connect the non-inverting input terminal of the trans-impedance amplifier, the signal output end and described anti-
Feed resistance R5 is separately connected the output end of the two-stage amplifier.
Further, the two-stage amplifier is broad band amplifier.
It further, further include the DC power supply powered for the trans-impedance amplifier and the two-stage amplifier, the direct current
Power supply includes anode Vcc and cathode Vee.
Further, the signal input part includes current source and the input end capacitor in parallel with the current source.
It further, further include one end ground connection of the resistance R1, the resistance R1 in parallel with the compensating electric capacity C2, resistance value is
10kΩ。
It further, further include resistance R2 between the trans-impedance amplifier and the two-stage amplifier, the resistance of the resistance R2
Value is 500 Ω, and the one end the resistance R2 connects the output end of the trans-impedance amplifier, and the other end connects the second level amplification
The non-inverting input terminal of device.
It further, further include resistance R7, one end of the resistance R7 connects the output end of the trans-impedance amplifier, the other end
Ground connection, the resistance value of the resistance R7 are 100k Ω.
Further, further include one end ground connection of resistance R3 and resistance R4, the resistance R3, the other end respectively with resistance R4 and
The inverting input terminal of the two-stage amplifier connects, and the other end of resistance R4 is connect with the output end of the two-stage amplifier.
Further, the resistance value of the resistance R3 is 200 Ω, and the resistance value of the resistance R4 is 1k Ω.
Further, the feedback resistance R5 is 2k Ω, and the compensation resistance R6 is 10k Ω, and the compensating electric capacity C2 is
100pF, the capacitance C3 are 1pF.
The beneficial effects of the present invention are: it is preposition input basis that the present invention, which meets noise requirements with trans-impedance amplifier, it is defeated
Outlet direct-coupling two-stage amplifier, the detection suitable for low-frequency weak signal；Under conditions of the amplification of above-mentioned two-stage, setting is adjusted
The resistance and capacitor for saving feedback, make circuit transimpedance gain with higher, while having wider amplification band, are suitble to low frequency letter
Number amplification, noise is extremely low after amplification, thus the present invention be better than existing pre-amplification circuit.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 is the embodiment of the present invention in circuit diagram；
Fig. 2 is the circuit connecting relation schematic diagram of the embodiment of the present invention；
Fig. 3 is the amplitude simulation result diagram of the amplified signal of the embodiment of the present invention；
Fig. 4 is the bandwidth of operation simulation result diagram of the amplified signal of the embodiment of the present invention；
Fig. 5 is the noiseproof feature simulation result diagram of the amplified signal of the embodiment of the present invention.
Specific embodiment
Referring to Figures 1 and 2, the small-signal pre-amplification circuit of a kind of high-gain, the signal input including small-signal
End, trans-impedance amplifier (TIA is denoted as in figure), two-stage amplifier (WDA is denoted as in figure), signal output end (are expressed as in figure
VF1), feedback resistance R5, compensation resistance R6, compensating electric capacity C2 and capacitance C3, the signal input part connection are described across resistance
The inverting input terminal of amplifier, the output end of the trans-impedance amplifier connects the noninverting input of the two-stage amplifier, described
Feedback circuit include feedback resistance R5, compensation resistance R6, compensating electric capacity C2 and capacitance C3, the capacitance C3 and
Both compensation resistance R6 are coupled in parallel to the trans-impedance amplifier output end and inverting input terminal, compensating electric capacity C2 connection institute
The non-inverting input terminal of trans-impedance amplifier is stated, the signal output end and feedback resistance R5 are separately connected the defeated of the two-stage amplifier
Outlet.
The two-stage amplifier is broad band amplifier, and the broad band amplifier of model LMH6714 is selected in the present embodiment, described
Signal input part includes current source and the input end capacitor in parallel with the current source, and the present embodiment can be equivalent at a photoelectricity two
Pole pipe, while the resistance for the one big resistance value that can also connect improve input impedance, improve the absorbability of signal source, big resistance
Resistance value should be more than 100k Ω.
It further include the DC power supply powered for the trans-impedance amplifier and the two-stage amplifier, the DC power supply includes
Positive Vcc and cathode Vee, Vcc voltage-to-ground is+5V in the present embodiment, and Vee voltage-to-ground is -5V.
It further include one end ground connection of the resistance R1, the resistance R1 in parallel with the compensating electric capacity C2.It is described to amplify across resistance
It further include resistance R2 between device and the two-stage amplifier, the one end the resistance R2 connects the output of the trans-impedance amplifier
End, the other end connect the non-inverting input terminal of the two-stage amplifier.It further include resistance R7, described in one end connection of the resistance R7
The output end of trans-impedance amplifier, other end ground connection, the resistance value of the resistance R7 are 100k Ω.It further include resistance R3 and resistance R4,
One end of the resistance R3 is grounded, and the other end is connect with the inverting input terminal of resistance R4 and the two-stage amplifier respectively, resistance
The other end of R4 is connect with the output end of the two-stage amplifier.
Above-mentioned each capacitor and resistance, value is as follows in the present embodiment, and feedback resistance R5 is 2k Ω, and compensation resistance R6 is
10k Ω, compensating electric capacity C2 are 100pF, and capacitance C3 is 1pF, and resistance R1 is 10k Ω, and resistance R2 is 500 Ω, and resistance R3 is
200 Ω, resistance R4 are 1k Ω.Based on above-mentioned condition emulate it is as follows: when input signal be amplitude be 10uA, frequency 10kHz
When sine wave, output signal is the equal frequency sine waves that amplitude is 497.68mV (about 500mV), as shown in Figure 3.
Equally the bandwidth of operation of the embodiment of the present invention is emulated, giving amplitude in the signal input part is 10uA,
Frequency is the small signal of 10kHz, carries out ac sweep emulation to it, and scan frequency obtains step voltage increasing from 1Hz to 100MHz
Beneficial curve is as shown in Figure 4.Simulation result shows that first order transimpedance gain reaches 10k Ω, second level electricity in output signal passband
Pressure gain reaches 15dB, bandwidth 15MHz, and upper cut-off frequency has reached 100MHz.
The noiseproof feature of the embodiment of the present invention can be indicated that it is making an uproar inside entire amplifying circuit by equivalent input noise
Sound source, such as electronic thermal noise, the shot noise of semiconductor element and low-frequency noise etc. are all reflected in input terminal.Circuit is carried out etc.
The test of input noise is imitated, simulation result is as shown in figure 5, wherein ordinate indicates the power spectral density of equivalent input noise, electricity
The equivalent input noise on road equivalent input noise in frequency 1Hz to 1MHz is pV/ √ HZ rank.Noise Simulation is the result shows that choosing
Use the chip of high-precision low noise as device, the amplification circuit structure of the composition negative feedback network of low-noise operational amplifier can obtain
Excellent noise parameter.
The present invention is based on trans-impedance amplifiers to carry out preposition amplification, has higher input impedance maximum in signal input part
Absorption signal source, the output end of final two-stage amplifier have lower output impedance to be optimal circuit performance, present invention electricity
Road transimpedance gain with higher, low drifting, high stable, strong anti-interference, low noise have suitable passband, and in passband
There is higher gain in band, the linearity is good, and signal output waveform is undistorted, guarantees that signal can be significantly amplified.
The above, only presently preferred embodiments of the present invention, the invention is not limited to above embodiment, as long as
It reaches technical effect of the invention with identical means, all should belong to protection scope of the present invention.
Claims (10)
1. a kind of small-signal pre-amplification circuit of high-gain, it is characterised in that: signal input part including small-signal, across
Impedance amplifier, two-stage amplifier, signal output end, feedback resistance R5, compensation resistance R6, compensating electric capacity C2 and capacitance C3,
The signal input part connects the inverting input terminal of the trans-impedance amplifier, the output end connection described two of the trans-impedance amplifier
The noninverting input of grade amplifier, both the capacitance C3 and compensation resistance R6 are coupled in parallel to the trans-impedance amplifier
Output end and inverting input terminal, the compensating electric capacity C2 connect the non-inverting input terminal of the trans-impedance amplifier, the signal output
End and the feedback resistance R5 are separately connected the output end of the two-stage amplifier.
2. a kind of small-signal pre-amplification circuit of high-gain according to claim 1, it is characterised in that: the second level
Amplifier is broad band amplifier.
3. a kind of small-signal pre-amplification circuit of high-gain according to claim 1 or 2, it is characterised in that: also wrap
The DC power supply powered for the trans-impedance amplifier and the two-stage amplifier is included, the DC power supply includes anode Vcc and bears
Pole Vee.
4. a kind of small-signal pre-amplification circuit of high-gain according to claim 1, it is characterised in that: the signal
Input terminal includes current source and the input end capacitor in parallel with the current source.
5. a kind of small-signal pre-amplification circuit of high-gain according to claim 1, it is characterised in that: further include with
One end of the resistance R1, the resistance R1 of the compensating electric capacity C2 parallel connection are grounded, and resistance value is 10k Ω.
6. a kind of small-signal pre-amplification circuit of high-gain according to claim 1, it is characterised in that: described across resistance
It further include resistance R2 between amplifier and the two-stage amplifier, the resistance value of the resistance R2 is 500 Ω, the one end the resistance R2
The output end of the trans-impedance amplifier is connected, the other end connects the non-inverting input terminal of the two-stage amplifier.
7. a kind of small-signal pre-amplification circuit of high-gain according to claim 6, it is characterised in that: further include electricity
R7 is hindered, one end of the resistance R7 connects the output end of the trans-impedance amplifier, other end ground connection, and the resistance value of the resistance R7 is
100kΩ。
8. a kind of small-signal pre-amplification circuit of high-gain according to claim 1, it is characterised in that: further include electricity
One end ground connection of R3 and resistance R4, the resistance R3 are hindered, the other end is defeated with the reverse phase of resistance R4 and the two-stage amplifier respectively
Enter end connection, the other end of resistance R4 is connect with the output end of the two-stage amplifier.
9. a kind of small-signal pre-amplification circuit of high-gain according to claim 8, it is characterised in that: the resistance
The resistance value of R3 is 200 Ω, and the resistance value of the resistance R4 is 1k Ω.
10. a kind of small-signal pre-amplification circuit of high-gain according to claim 1, it is characterised in that: described anti-
Feed resistance R5 is 2k Ω, and the compensation resistance R6 is 10k Ω, and the compensating electric capacity C2 is 100pF, and the capacitance C3 is
1pF。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811137722.6A CN109150123A (en) | 2018-09-28 | 2018-09-28 | A kind of small-signal pre-amplification circuit of high-gain |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811137722.6A CN109150123A (en) | 2018-09-28 | 2018-09-28 | A kind of small-signal pre-amplification circuit of high-gain |
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| CN109150123A true CN109150123A (en) | 2019-01-04 |
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| CN201811137722.6A Pending CN109150123A (en) | 2018-09-28 | 2018-09-28 | A kind of small-signal pre-amplification circuit of high-gain |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109709152A (en) * | 2019-01-30 | 2019-05-03 | 南通大学 | An Insulating Thin Film Measuring System for Weak Currents in the Scale of fA～pA |
| CN109861658A (en) * | 2019-01-09 | 2019-06-07 | 天津大学 | Broadband, Low Noise Differential Amplifier Circuit for Weak Signal Measurement |
| CN110557098A (en) * | 2019-08-21 | 2019-12-10 | 首都师范大学 | positive feedback transimpedance amplification circuit and adjustment method |
| CN111077361A (en) * | 2020-01-14 | 2020-04-28 | 西安深瞳智控技术有限公司 | Detection apparatus suitable for micro current on laser guide head |
| CN113467320A (en) * | 2021-07-21 | 2021-10-01 | 西安龙飞电气技术有限公司 | Weak signal detection algorithm based on gain compensation |
| CN115575694A (en) * | 2022-12-09 | 2023-01-06 | 阳明量子科技(深圳)有限公司 | Constant potential rectifier capable of detecting micro-current signal |
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| CN105763163A (en) * | 2016-02-02 | 2016-07-13 | 合肥工业大学智能制造技术研究院 | Novel ultrahigh frequency weak signal combined amplification circuit |
| CN107144719A (en) * | 2017-05-04 | 2017-09-08 | 北京理工大学 | A kind of high-precision testing weak signals instrument and method of testing |
| CN207910740U (en) * | 2018-02-08 | 2018-09-25 | 佛山市顺德区中山大学研究院 | A kind of gain increases and increased differential amplifier circuit with frequency |
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2018
- 2018-09-28 CN CN201811137722.6A patent/CN109150123A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200966032Y (en) * | 2006-10-08 | 2007-10-24 | 薛文伟 | Weak AC signal preamplifier circuit |
| CN102075150A (en) * | 2010-09-29 | 2011-05-25 | 深圳市蓝韵实业有限公司 | Photoelectric signal preconditioning amplifying circuit of auto iris for digital gastrointestinal machine |
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| CN207910740U (en) * | 2018-02-08 | 2018-09-25 | 佛山市顺德区中山大学研究院 | A kind of gain increases and increased differential amplifier circuit with frequency |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109861658A (en) * | 2019-01-09 | 2019-06-07 | 天津大学 | Broadband, Low Noise Differential Amplifier Circuit for Weak Signal Measurement |
| CN109709152A (en) * | 2019-01-30 | 2019-05-03 | 南通大学 | An Insulating Thin Film Measuring System for Weak Currents in the Scale of fA～pA |
| CN109709152B (en) * | 2019-01-30 | 2021-04-06 | 南通大学 | Insulation film measuring system for fA-pA magnitude weak current |
| CN110557098A (en) * | 2019-08-21 | 2019-12-10 | 首都师范大学 | positive feedback transimpedance amplification circuit and adjustment method |
| CN111077361A (en) * | 2020-01-14 | 2020-04-28 | 西安深瞳智控技术有限公司 | Detection apparatus suitable for micro current on laser guide head |
| CN113467320A (en) * | 2021-07-21 | 2021-10-01 | 西安龙飞电气技术有限公司 | Weak signal detection algorithm based on gain compensation |
| CN115575694A (en) * | 2022-12-09 | 2023-01-06 | 阳明量子科技(深圳)有限公司 | Constant potential rectifier capable of detecting micro-current signal |
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Application publication date: 20190104 |