CN103457547A - Deep negative feedback amplification circuit - Google Patents
Deep negative feedback amplification circuit Download PDFInfo
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- CN103457547A CN103457547A CN2013104077065A CN201310407706A CN103457547A CN 103457547 A CN103457547 A CN 103457547A CN 2013104077065 A CN2013104077065 A CN 2013104077065A CN 201310407706 A CN201310407706 A CN 201310407706A CN 103457547 A CN103457547 A CN 103457547A
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- amplifier
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Abstract
The invention discloses a deep negative feedback amplification circuit which comprises a field effect tube, a triode and an operational amplifier. Two-stage negative feedback is introduced into the deep negative feedback amplification circuit, so that the gain of the amplification circuit is decided by the feedback factor of a feedback network and has nothing to do with a basic amplifying circuit; therefore, the stability of closed-loop gain is improved, non-linear distortion is reduced, the deep negative feedback amplification circuit has an obvious effect for improving the signal to noise ratio of a system, and the noise in a feedback loop can be better inhibited.
Description
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Technical field
The present invention relates to a kind of amplifying circuit, be specifically related to a kind of deep negative feedback amplifier.
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 deep negative feedback amplifier, 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 deep negative feedback amplifier, this circuit comprises field effect transistor, triode and amplifier, the grid of field effect transistor is the ground connection of connecting with the 4th resistance by the first electric capacity, the source electrode of field effect transistor is by the first grounding through resistance, input voltage is applied to the 4th resistance two ends, and the signal of telecommunication is sent to the emitter of triode, the base earth of triode by the drain electrode of field effect transistor; The signal of telecommunication is sent into the positive input of the first amplifier by the collector electrode of triode by the 3rd electric capacity and the 5th resistance, its inverting input is by the second grounding through resistance, the 3rd resistance feeds back to the first amplifier output end signal the positive input of this amplifier, the output end signal of the first amplifier inputs to the positive input of the second amplifier by the 7th electric capacity and the 6th resistance, its inverting input is by the 7th grounding through resistance, and the output end signal of the second amplifier is by the positive input of parallel feedback to two amplifier of the 8th resistance and the 5th electric capacity.
Preferably, the output end signal of the second amplifier is by the positive input of the 6th capacitive feedback to the first amplifier.
Preferably, field effect transistor adopts technotron.
Beneficial effect: the present invention is by introducing the secondary 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 field effect transistor, triode and amplifier, the grid of field effect transistor Q2 is the ground connection of connecting with the 4th resistance R 4 by the first capacitor C 1, the source electrode of field effect transistor Q2 is by the first resistance R 1 ground connection, input voltage is applied to the 4th resistance R 4 two ends, the signal of telecommunication is sent to the emitter of triode Q1, the base earth of triode Q1 by the drain electrode of field effect transistor Q2, the signal of telecommunication is sent into the positive input of the first amplifier U1 by the collector electrode of triode Q1 by the 3rd capacitor C 3 and the 5th resistance R 5, its inverting input is by the second resistance R 2 ground connection, the 3rd resistance R 3 feeds back to the first amplifier U1 output end signal the positive input of this amplifier, the output end signal of the first amplifier U1 inputs to the positive input of the second amplifier U2 by the 7th capacitor C 7 and the 6th resistance R 6, its inverting input is by the 7th resistance R 7 ground connection, the output end signal of the second amplifier U2 is by the positive input of parallel feedback to the two amplifier U2 of the 8th resistance R 8 and the 5th capacitor C 5.
The output end signal of the second amplifier U2 feeds back to the positive input of the first amplifier U1 by the 6th electric capacity R6; Field effect transistor Q2 adopts technotron.
The present invention is simple in structure, input signal is through amplifying, triode serves as follower it is exported, through the one-level negative feedback, positive input by the output voltage partial feedback to operational amplifier, again by the secondary negative feedback, an output voltage part is fed back to the one-level amplifier, a part feeds back to the secondary 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 (3)
1. a deep negative feedback amplifier, it is characterized in that: comprise field effect transistor, triode and amplifier, the grid of described field effect transistor (Q2) is the ground connection of connecting with the 4th resistance (R4) by the first electric capacity (C1), the source electrode of field effect transistor (Q2) is by the first resistance (R1) ground connection, input voltage is applied to the 4th resistance (R4) two ends, the signal of telecommunication is sent to the emitter of triode (Q1), the base earth of described triode (Q1) by the drain electrode of field effect transistor (Q2), the signal of telecommunication is sent into the positive input of the first amplifier (U1) by the collector electrode of triode (Q1) by the 3rd electric capacity (C3) and the 5th resistance (R5), its inverting input is by the second resistance (R2) ground connection, the 3rd resistance (R3) feeds back to the first amplifier (U1) output end signal the positive input of this amplifier, the output end signal of described the first amplifier (U1) inputs to the positive input of the second amplifier (U2) by the 7th electric capacity (C7) and the 6th resistance (R6), its inverting input is by the 7th resistance (R7) ground connection, the output end signal of the second amplifier (U2) is by the positive input of parallel feedback to two amplifier (U2) of the 8th resistance (R8) and the 5th electric capacity (C5).
2. a kind of negative feedback amplifier circuit according to claim 1, it is characterized in that: the output end signal of described the second amplifier (U2) feeds back to the positive input of the first amplifier (U1) by the 6th electric capacity (R6).
3. a kind of negative feedback amplifier circuit according to claim 1, is characterized in that: described field effect transistor (Q2) employing technotron.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013104077065A CN103457547A (en) | 2013-09-10 | 2013-09-10 | Deep negative feedback amplification circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013104077065A CN103457547A (en) | 2013-09-10 | 2013-09-10 | Deep negative feedback amplification circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103457547A true CN103457547A (en) | 2013-12-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013104077065A Pending CN103457547A (en) | 2013-09-10 | 2013-09-10 | Deep negative feedback amplification circuit |
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| CN (1) | CN103457547A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104459359A (en) * | 2014-12-14 | 2015-03-25 | 东北电力大学 | VDMOS device low-frequency noise measuring device |
| CN104617900A (en) * | 2015-01-19 | 2015-05-13 | 信阳农林学院 | Network signal transmission amplification circuit |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040100324A1 (en) * | 2002-11-21 | 2004-05-27 | Fryette Steven M. | Dynamic sensing regulator |
| CN101246025A (en) * | 2008-03-21 | 2008-08-20 | 东南大学 | Wide-field full-optical fiber perturbance locating signal time gain control device |
| CN101373958A (en) * | 2007-08-23 | 2009-02-25 | 那微微电子科技（上海）有限公司 | Automatic gain control circuit and receiver using the same |
| CN101729026A (en) * | 2008-10-28 | 2010-06-09 | 王震武 | Feedback shift (FBS) type compensating network and application in audio power amplifier thereof |
-
2013
- 2013-09-10 CN CN2013104077065A patent/CN103457547A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040100324A1 (en) * | 2002-11-21 | 2004-05-27 | Fryette Steven M. | Dynamic sensing regulator |
| CN101373958A (en) * | 2007-08-23 | 2009-02-25 | 那微微电子科技（上海）有限公司 | Automatic gain control circuit and receiver using the same |
| CN101246025A (en) * | 2008-03-21 | 2008-08-20 | 东南大学 | Wide-field full-optical fiber perturbance locating signal time gain control device |
| CN101729026A (en) * | 2008-10-28 | 2010-06-09 | 王震武 | Feedback shift (FBS) type compensating network and application in audio power amplifier thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104459359A (en) * | 2014-12-14 | 2015-03-25 | 东北电力大学 | VDMOS device low-frequency noise measuring device |
| CN104617900A (en) * | 2015-01-19 | 2015-05-13 | 信阳农林学院 | Network signal transmission amplification circuit |
| CN104617900B (en) * | 2015-01-19 | 2017-12-08 | 信阳农林学院 | A kind of network signal transmits amplifying circuit |
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Application publication date: 20131218 |