CN103475317A - Negative feedback amplifying circuit - Google Patents
Negative feedback amplifying circuit Download PDFInfo
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- CN103475317A CN103475317A CN2013104066732A CN201310406673A CN103475317A CN 103475317 A CN103475317 A CN 103475317A CN 2013104066732 A CN2013104066732 A CN 2013104066732A CN 201310406673 A CN201310406673 A CN 201310406673A CN 103475317 A CN103475317 A CN 103475317A
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Abstract
The invention discloses a negative feedback amplifying circuit which comprises a following unit, an amplifying unit and a negative feedback unit. By introducing deep negative feedback, gain of the amplifying circuit depends on feedback factors of a feedback network and is independent of a basic amplifying circuit, therefore, stability of closed-loop gain is improved, non-linear distortion is reduced, the signal to noise ratio of a system can be improved effectively, and noise in a feedback ring can be restrained well.
Description
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Technical field
The present invention relates to a kind of amplifying circuit, be specifically related to a kind of negative feedback amplifier circuit.
Background technology
At present, all require to introduce negative feedback in most amplifying circuit, feedback refers to passes through feedback network to part or all of output voltage or output circuit, be transmitted back to the input circuit of amplifying circuit by certain mode, with the process of impact input electric weight, after introducing negative feedback, make many performance index of amplifying circuit be improved, but often make the closed loop gain of amplifying return circuit reduce, make the amplification circuit structure complexity, less stable.
Therefore, need a kind of new technical scheme to solve the problems referred to above.
Summary of the invention
Goal of the invention: for the problem and shortage of above-mentioned existing existence, the purpose of this invention is to provide a kind of negative feedback amplifier circuit, simple in structure, stability is strong.
Technical scheme: for achieving the above object, the technical solution used in the present invention is: a kind of negative feedback amplifier circuit, this circuit comprises follows unit, amplifying unit and negative feedback unit, the grid that the input of amplifying unit is the 3rd field effect transistor, output consists of jointly the drain electrode of the 3rd field effect and the drain electrode of the second field effect, the source electrode of the 3rd field effect is connected with the grid of the second field effect, and the source electrode of the 3rd field effect is connected with its grid by the first electric capacity; The source electrode of the second field effect transistor is by the series connection ground connection of the first resistance and the second resistance; Follow unit and comprise triode, the collector electrode that its output is triode, the collector electrode of triode is by the 3rd electric capacity access positive voltage, and its emitter is connected with the output of amplifying unit, and the base stage of triode is by the 4th capacity earth; The negative feedback unit comprises operational amplifier, follow unit and the signal of telecommunication is sent to the positive input of operational amplifier by the 5th resistance, its reverse inter-input-ing ending grounding, feedback network consists of the 6th electric capacity and the 3rd resistance, and the operational amplifier output terminal signal feedback is arrived to positive input.
Preferably, the drain electrode of the drain electrode of the 3rd field effect and the second field effect is connected by the 5th electric capacity.
Preferably, the source electrode of the second field effect transistor is by the second capacity earth.
Preferably, the input voltage of amplifying unit is applied to the 4th resistance two ends, and an end of the 4th resistance connects the grid of the 3rd field effect transistor, its other end ground connection.
Beneficial effect: the present invention is by introducing the deep negative feedback, the gain of amplifying circuit is decided by the feedback factor of feedback network, irrelevant with basic amplifier circuit, therefore improved the stability of closed loop gain, reduce nonlinear distortion, the signal to noise ratio of improving system is had to positive effect, suppress preferably noise in feedback loop.
The accompanying drawing explanation
Fig. 1 is circuit diagram of the present invention.
Embodiment
As shown in Figure 1, the present invention includes and follow unit, amplifying unit and negative feedback unit, the grid that the input of amplifying unit is the 3rd field effect transistor Q3, the input voltage of amplifying unit is applied to the 4th resistance R 4 two ends, one end of the 4th resistance R 4 connects the grid of the 3rd field effect transistor Q3, its other end ground connection, output consists of jointly the drain electrode of the 3rd field effect Q3 and the drain electrode of the second field effect Q2, the source electrode of the 3rd field effect Q3 is connected with the grid of the second field effect Q2, the drain electrode of the drain electrode of the 3rd field effect Q3 and the second field effect Q2 is connected by the 5th electric capacity R5, the source electrode of the 3rd field effect Q3 is connected with its grid by the first capacitor C 1, the source electrode of the second field effect transistor Q2 is by the series connection ground connection of the first resistance R 1 and the second resistance R 2, and simultaneously, the source electrode of the second field effect transistor Q2 is by the second capacitor C 2 ground connection, follow unit and comprise triode Q1, the collector electrode that its output is triode Q1, the collector electrode of triode Q1 is by the 3rd capacitor C 3 access positive voltages, and its emitter is connected with the output of amplifying unit, and the base stage of triode Q1 is by the 4th capacitor C 4 ground connection, the negative feedback unit comprises operational amplifier U1, follow unit and the signal of telecommunication is sent to the positive input of operational amplifier U1 by the 5th resistance R 5, its reverse inter-input-ing ending grounding, feedback network consists of the 6th capacitor C 6 and the 3rd resistance R 3, and operational amplifier U1 output end signal is fed back to positive input.
The present invention is simple in structure, input signal is through amplifying unit, by following unit output, through the one-level negative feedback, positive input by the output voltage partial feedback to operational amplifier, by introducing the deep negative feedback, the gain of amplifying circuit is decided by the feedback factor of feedback network, irrelevant with basic amplifier circuit, therefore improved the stability of closed loop gain, reduce nonlinear distortion, the signal to noise ratio of improving system is had to positive effect, suppress preferably noise in feedback loop.
Claims (4)
1. a negative feedback amplifier circuit, it is characterized in that: comprise and follow unit, amplifying unit and negative feedback unit, the grid that the input of described amplifying unit is the 3rd field effect transistor (Q3), output consists of jointly the drain electrode of the 3rd field effect (Q3) and the drain electrode of the second field effect (Q2), the source electrode of the 3rd field effect (Q3) is connected with the grid of the second field effect (Q2), and the source electrode of described the 3rd field effect (Q3) is connected with its grid by the first electric capacity (C1); The source electrode of the second field effect transistor (Q2) is by the series connection ground connection of the first resistance (R1) and the second resistance (R2); The described unit of following comprises triode (Q1), the collector electrode that its output is triode (Q1), the collector electrode of described triode (Q1) is by the 3rd electric capacity (C3) access positive voltage, its emitter is connected with the output of amplifying unit, and the base stage of described triode (Q1) is by the 4th electric capacity (C4) ground connection; Described negative feedback unit comprises operational amplifier (U1), follow unit and the signal of telecommunication is sent to the positive input of operational amplifier (U1) by the 5th resistance (R5), its reverse inter-input-ing ending grounding, feedback network consists of the 6th electric capacity (C6) and the 3rd resistance (R3), and operational amplifier (U1) output end signal is fed back to positive input.
2. a kind of negative feedback amplifier circuit according to claim 1, it is characterized in that: the drain electrode of the drain electrode of described the 3rd field effect (Q3) and the second field effect (Q2) is connected by the 5th electric capacity (R5).
3. a kind of negative feedback amplifier circuit according to claim 1 is characterized in that: the source electrode of described the second field effect transistor (Q2) is by the second electric capacity (C2) ground connection.
4. a kind of negative feedback amplifier circuit according to claim 1, it is characterized in that: the input voltage of described amplifying unit is applied to the 4th resistance (R4) two ends, one end of described the 4th resistance (R4) connects the grid of the 3rd field effect transistor (Q3), its other end ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013104066732A CN103475317A (en) | 2013-09-10 | 2013-09-10 | Negative feedback amplifying circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013104066732A CN103475317A (en) | 2013-09-10 | 2013-09-10 | Negative feedback amplifying circuit |
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| Publication Number | Publication Date |
|---|---|
| CN103475317A true CN103475317A (en) | 2013-12-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013104066732A Pending CN103475317A (en) | 2013-09-10 | 2013-09-10 | Negative feedback amplifying circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104828263A (en) * | 2015-04-07 | 2015-08-12 | 中国科学院空间科学与应用研究中心 | Detection device for spacecraft surface charging effects |
| CN111384775A (en) * | 2018-12-27 | 2020-07-07 | 汉能移动能源控股集团有限公司 | Direct current photovoltaic power carrier data transmission device |
| CN113520407A (en) * | 2021-07-14 | 2021-10-22 | 深圳英智科技有限公司 | Electroencephalogram amplifier |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1218322A (en) * | 1997-11-25 | 1999-06-02 | 罗姆股份有限公司 | Battery charging circuit and battery charging device |
| CN2544264Y (en) * | 2002-06-06 | 2003-04-09 | 上海精密科学仪器有限公司 | Spectral color measurer using electronic anulog switch integrated circuit |
| US20040164796A1 (en) * | 2001-06-27 | 2004-08-26 | Masataka Nakamura | Low-noise active rc signal processing circuit |
| CN203057076U (en) * | 2012-12-06 | 2013-07-10 | 四川高软软件科技有限公司 | Amplifying circuit with high upper limiting frequency |
-
2013
- 2013-09-10 CN CN2013104066732A patent/CN103475317A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1218322A (en) * | 1997-11-25 | 1999-06-02 | 罗姆股份有限公司 | Battery charging circuit and battery charging device |
| US20040164796A1 (en) * | 2001-06-27 | 2004-08-26 | Masataka Nakamura | Low-noise active rc signal processing circuit |
| CN2544264Y (en) * | 2002-06-06 | 2003-04-09 | 上海精密科学仪器有限公司 | Spectral color measurer using electronic anulog switch integrated circuit |
| CN203057076U (en) * | 2012-12-06 | 2013-07-10 | 四川高软软件科技有限公司 | Amplifying circuit with high upper limiting frequency |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104828263A (en) * | 2015-04-07 | 2015-08-12 | 中国科学院空间科学与应用研究中心 | Detection device for spacecraft surface charging effects |
| CN111384775A (en) * | 2018-12-27 | 2020-07-07 | 汉能移动能源控股集团有限公司 | Direct current photovoltaic power carrier data transmission device |
| CN113520407A (en) * | 2021-07-14 | 2021-10-22 | 深圳英智科技有限公司 | Electroencephalogram amplifier |
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Application publication date: 20131225 |