CN106656087A - Automatic gain control loop - Google Patents
Automatic gain control loop Download PDFInfo
- Publication number
- CN106656087A CN106656087A CN201611238490.4A CN201611238490A CN106656087A CN 106656087 A CN106656087 A CN 106656087A CN 201611238490 A CN201611238490 A CN 201611238490A CN 106656087 A CN106656087 A CN 106656087A
- Authority
- CN
- China
- Prior art keywords
- amplifier
- diode
- resistance
- control loop
- operational amplifier
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000003990 capacitor Substances 0.000 abstract 4
- 230000005611 electricity Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005236 sound signal Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3036—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers
- H03G3/3042—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers in modulators, frequency-changers, transmitters or power amplifiers
Landscapes
- Control Of Amplification And Gain Control (AREA)
Abstract
The invention discloses an automatic gain control loop comprising an operational amplifier U1, an operational amplifier U2, a resistor R1, a capacitor C1, a diode D1 and a diode D2, wherein an inverted-phase end of the operational amplifier U1 is connected with an input signal Vi, an output end of the operational amplifier U1 is connected with the anode of the diode D2, the cathode of the diode D2 is separately connected with an output end Vo and a same-phase end of the operational amplifier U2, the inverted-phase end of the operational amplifier U2 is separately connected with the resistor R1 and a capacitor C2, the other end of the resistor R1 is connected with a signal V1, the other end of the capacitor C2 is connected with the anode of the diode D1 and the output end of the operational amplifier U2, the cathode of the diode D1 is connected with a resistor R3, and the other end of the resistor R3 is separately connected with the capacitor C1, a resistor R2 and the same-phase end of the operational amplifier U1. The automatic gain control loop adopts two operational amplifiers to form a control loop, thereby locating the output range within a certain linear range, and has the advantages of simple circuit structure, low cost, small volume and wide application range.
Description
Technical field
The present invention relates to a kind of voltage control circuit, specifically a kind of automatic gain control loop.
Background technology
The impact of the factors such as the unstable and spatial transmission due to broadcasting station transmitter, can cause the radio station letter that radio is received
Number when it is big when it is little, be reacted to speaker and just occur that sound is suddenly big or suddenly small, in order to ensure loudspeaker sound size not because receive electricity
Platform signal intensity and change, gain feedback control circuit is both provided with radio.
The effect of gain feedback control circuit is the gain that amplifying circuit is automatically adjusted according to the size for receiving radio signals,
Guarantee is sent to the audio signal size substantially constant of rear polar circuit, such as, when radio signals amplitude hour is received, circuit can be automatic
Amplifying circuit is adjusted, allows its gain to rise, conversely, then allowing the gain of amplifying circuit to decline；Current gain feedback control electricity
The design direction on road is to take into account stability and miniaturization.
The content of the invention
It is an object of the invention to provide a kind of automatic gain control loop, to solve above-mentioned background technology in propose ask
Topic.
For achieving the above object, the present invention provides following technical scheme：
A kind of automatic gain control loop, including amplifier U1, amplifier U2, resistance R1, electric capacity C1, diode D1 and diode
D2, it is characterised in that amplifier U1 end of oppisite phase connection input signal Vi, amplifier U1 outfan connection diode D2 positive poles, two
Pole pipe D2 negative pole connects respectively output end vo and amplifier U2 in-phase end, and amplifier U2 end of oppisite phase connects respectively resistance R1 and electric capacity C2,
The resistance R1 other ends connect signal V1, and the electric capacity C2 other ends connect respectively diode D1 positive poles and amplifier U2 outfan, diode
D1 negative poles connect resistance R3, and the resistance R3 other ends connect respectively electric capacity C1, resistance R2 and amplifier U1 in-phase end, the electric capacity C1 other ends
The connection resistance R2 other ends are simultaneously grounded；Amplifier U2 adopts OPA680.
As further scheme of the invention：It is reference voltage signal that amplifier U1 adopts LM324, signal V1.
Compared with prior art, the invention has the beneficial effects as follows：Automatic gain control loop of the present invention adopts two amplifiers
One control loop of composition, it is ensured that output voltage is in certain range of linearity, and circuit structure is simple, low cost, small volume,
It is applied widely.
Description of the drawings
Fig. 1 is the circuit diagram of automatic gain control loop.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than the embodiment of whole.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
Fig. 1 is referred to, in the embodiment of the present invention, a kind of automatic gain control loop, including amplifier U1, amplifier U2, resistance
R1, electric capacity C1, diode D1 and diode D2, the amplifier U1 end of oppisite phase connects input signal Vi, the connection of amplifier U1 outfan
Diode D2 positive poles, diode D2 negative poles connect respectively output end vo and amplifier U2 in-phase end, and amplifier U2 end of oppisite phase connects respectively
Resistance R1 and electric capacity C2, the resistance R1 other end connects signal V1, and the electric capacity C2 other ends connect respectively diode D1 positive poles and amplifier
U2 outfans, diode D1 negative poles connection resistance R3, the resistance R3 other ends connect respectively electric capacity C1, resistance R2 and amplifier U1 homophase
End, the electric capacity C1 other ends connection resistance R2 other ends are simultaneously grounded；Amplifier U1 adopts LM324；Amplifier U2 is adopted
OPA680；The signal V1 is reference voltage signal.
Fig. 1 is referred to, the present invention is with amplifier OPA680 come feedback output end Vo voltages, diode D1, electric capacity C1 and resistance
R3 constitutes peak detector, and to the positive peak of output signal detection is carried out, and the control of reflection output voltage peak value is produced on C1
Voltage is sent to the in-phase end of U1, and when the positive peak of output end vo voltage is higher than reference voltage V1, the gain of VCA610 declines, from
And ensure output voltage in certain range of linearity.The partial pressure value of R1, R2 affects the conducting of diode D1, coordinates R3, C1
Time constant, determines that gain is started to control a little, and R1, C2 are used for the phase compensation of OPA680 feedback circuits.
It is obvious to a person skilled in the art that the invention is not restricted to the details of above-mentioned one exemplary embodiment, Er Qie
In the case of spirit or essential attributes without departing substantially from the present invention, the present invention can be in other specific forms realized.Therefore, no matter
From the point of view of which point, embodiment all should be regarded as exemplary, and be nonrestrictive, the scope of the present invention is by appended power
Profit is required rather than described above is limited, it is intended that all in the implication and scope of the equivalency of claim by falling
Change is included in the present invention.Any reference in claim should not be considered as and limit involved claim.
Moreover, it will be appreciated that although this specification is been described by according to embodiment, not each embodiment is only wrapped
Containing an independent technical scheme, this narrating mode of description is only that for clarity those skilled in the art should
Using description as an entirety, the technical scheme in each embodiment can also Jing it is appropriately combined, form those skilled in the art
Understandable other embodiment.
Claims (2)
1. a kind of automatic gain control loop, including amplifier U1, amplifier U2, resistance R1, electric capacity C1, diode D1 and diode
D2, it is characterised in that amplifier U1 end of oppisite phase connection input signal Vi, amplifier U1 outfan connection diode D2 positive poles, two
Pole pipe D2 negative pole connects respectively output end vo and amplifier U2 in-phase end, and amplifier U2 end of oppisite phase connects respectively resistance R1 and electric capacity C2,
The resistance R1 other ends connect signal V1, and the electric capacity C2 other ends connect respectively diode D1 positive poles and amplifier U2 outfan, diode
D1 negative poles connect resistance R3, and the resistance R3 other ends connect respectively electric capacity C1, resistance R2 and amplifier U1 in-phase end, the electric capacity C1 other ends
The connection resistance R2 other ends are simultaneously grounded；Amplifier U2 adopts OPA680.
2. automatic gain control loop according to claim 1, it is characterised in that amplifier U1 adopts LM324, signal
V1 is reference voltage signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611238490.4A CN106656087A (en) | 2016-12-28 | 2016-12-28 | Automatic gain control loop |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611238490.4A CN106656087A (en) | 2016-12-28 | 2016-12-28 | Automatic gain control loop |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106656087A true CN106656087A (en) | 2017-05-10 |
Family
ID=58835278
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611238490.4A Pending CN106656087A (en) | 2016-12-28 | 2016-12-28 | Automatic gain control loop |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106656087A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111490739A (en) * | 2019-01-25 | 2020-08-04 | 杭州海康威视数字技术股份有限公司 | Device and equipment for amplifying audio signal |
-
2016
- 2016-12-28 CN CN201611238490.4A patent/CN106656087A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111490739A (en) * | 2019-01-25 | 2020-08-04 | 杭州海康威视数字技术股份有限公司 | Device and equipment for amplifying audio signal |
| CN111490739B (en) * | 2019-01-25 | 2023-09-26 | 杭州海康威视数字技术股份有限公司 | Device and equipment for amplifying audio signal |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20170510 |
|
| WD01 | Invention patent application deemed withdrawn after publication |