CN2770224Y - Audio frequency amplifier low-frequency gain control circuit - Google Patents
Audio frequency amplifier low-frequency gain control circuit Download PDFInfo
- Publication number
- CN2770224Y CN2770224Y CN 200420099315 CN200420099315U CN2770224Y CN 2770224 Y CN2770224 Y CN 2770224Y CN 200420099315 CN200420099315 CN 200420099315 CN 200420099315 U CN200420099315 U CN 200420099315U CN 2770224 Y CN2770224 Y CN 2770224Y
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- gain control
- control circuit
- utility
- frequency
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Abstract
The utility model relates to a gain control circuit of an amplifier, particularly a low frequency gain control circuit of an audio frequency amplifier. The utility model has the technical scheme that the utility model comprises a differential amplifying circuit used for amplifying an input end signal and a gain control circuit. The gain control circuit is formed by the method that a resistor (R1) and a capacitor (C1) are connected in series. One end is connected to a base electrode of a transistor (Q1) arranged in the differential amplifier circuit, and the other end is connected to the ground, wherein the gain control circuit is connected in parallel with electrical inductance (L1) on the resistor (R1) which is used for raising dynamic low frequency of the differential amplifier. The utility model has the advantages that the utility model is suitable for the frequency amplifier and has obvious dynamic low frequency raising performance, thus, a traditional preposition active low frequency compensation circuit is saved, an amplification system is simplified, the cost is low and the distortion is reduced. In addition, the reliability and the maintainability of the whole system are improved.
Description
One, technical field: the utility model relates to a kind of amplifier gain control circuit, particularly a kind of audio frequency amplifier low-frequency gain control circuit.
Two, background technology: at present, OCL, the OTL etc. that generally use in the audio frequency amplifier are the coupled difference amplifier directly, its gain control circuit all is made of resistance, capacitances in series ground connection, and electric capacity has stopping direct current, the logical function that exchanges, by the size of resistance value being regulated the voltage ratio of associated negative-feedback circuit, the size of the size decision feedback quantity of its voltage ratio, thereby realize the adjusting of pair amplifier gain, but, the problem that exists is: do not have compensated frequency characteristic, especially do not have low frequency is realized significant compensation.
Three, summary of the invention: the purpose of this utility model is exactly the above-mentioned defective that exists at prior art, and a kind of audio frequency amplifier low-frequency gain control circuit is provided.
Its technical scheme is: comprise differential amplifier circuit, be used to amplify input end signal and gain control circuit, described gain control circuit is connected with electric capacity (C1) by resistance (R1), one is terminated at the base stage of transistor in the differential amplifier circuit (Q1), other end ground connection, wherein, described gain control circuit, go up shunt inductance (L1) at resistance (R1), be used to promote the dynamic low-frequency of differential amplifier.
Effect of the present utility model is: be applicable to audio frequency amplifier, have the performance that significant dynamic low-frequency promotes, thereby save traditional preposition active low-frequency compensation circuit, simplify amplification system, reduce cost, reduce distortion, improve reliability, the reliability, maintainability, safety and human factors of whole system.
Four, description of drawings:
Accompanying drawing is a structural representation of the present utility model.
Five, embodiment:
Below in conjunction with accompanying drawing, the utility model will be further described:
Comprise the differential amplifier circuit of forming by transistor Q1 and Q2, be used to amplify the signal that input end signal is promptly imported from the differential amplifier circuit input, and gain control circuit, connected with capacitor C 1 by resistance R 1, one is terminated at the base stage of transistor Q1 in the differential amplifier circuit, other end ground connection, wherein, described gain control circuit, shunt inductance L1 on resistance R 1 is used to promote the dynamic low-frequency of differential amplifier.
In addition, with reference to the accompanying drawings, be well-known to those skilled in the art, not be used in and give unnecessary details.
Claims (1)
1, a kind of audio frequency amplifier low-frequency gain control circuit comprises differential amplifier circuit, is used to amplify input end signal and gain control circuit; Described gain control circuit is connected with electric capacity (C1) by resistance (R1), and one is terminated at the base stage of transistor in the differential amplifier circuit (Q1), and other end ground connection is characterized in that:
Described gain control circuit is gone up shunt inductance (L1) at resistance (R1), is used to promote the dynamic low-frequency of differential amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420099315 CN2770224Y (en) | 2004-12-16 | 2004-12-16 | Audio frequency amplifier low-frequency gain control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420099315 CN2770224Y (en) | 2004-12-16 | 2004-12-16 | Audio frequency amplifier low-frequency gain control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2770224Y true CN2770224Y (en) | 2006-04-05 |
Family
ID=36691268
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420099315 Expired - Fee Related CN2770224Y (en) | 2004-12-16 | 2004-12-16 | Audio frequency amplifier low-frequency gain control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2770224Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103151997A (en) * | 2013-03-18 | 2013-06-12 | 成都龙腾中远信息技术有限公司 | High fidelity power amplifier |
-
2004
- 2004-12-16 CN CN 200420099315 patent/CN2770224Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103151997A (en) * | 2013-03-18 | 2013-06-12 | 成都龙腾中远信息技术有限公司 | High fidelity power amplifier |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |