GB1436627A - Automatic gain control circuit - Google Patents
Automatic gain control circuitInfo
- Publication number
- GB1436627A GB1436627A GB3219773A GB3219773A GB1436627A GB 1436627 A GB1436627 A GB 1436627A GB 3219773 A GB3219773 A GB 3219773A GB 3219773 A GB3219773 A GB 3219773A GB 1436627 A GB1436627 A GB 1436627A
- Authority
- GB
- United Kingdom
- Prior art keywords
- circuit
- gain
- impedance
- charges
- capacitor
- 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.)
- Expired
Links
- 239000003990 capacitor Substances 0.000 abstract 2
- 230000001960 triggered effect Effects 0.000 abstract 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
- H03G3/3005—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers
- H03G3/301—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers the gain being continuously variable
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Control Of Amplification And Gain Control (AREA)
Abstract
1436627 Automatic gain control MATSUSHITA ELECTRIC INDUSTRIAL CO Ltd 5 July 1973 32197/73 Heading H4R In response to a sudden change of input, an amplifier 8 in an age circuit produces two outputs varying differently in time which are rectified 18 and 12, 13 to produce D.C. control signals of which one is immediate and subsequently reduces whilst the other gradually increases, the combination controlling a variable impedance so as to exhibit negligible overshoot. As shown, a sudden increase in input level produces a corresponding output in the emitter circuit which is converted to a gradually increasing D.C. by the voltage doubler circuit 10-15 as capacitor 14 charges. The reduced impedance of the diodes 12, 13 increases the gain of the transistor 8 causing an immediate response in the collector circuit which diminishes as the gain reduces and capacitor 14 charges to the steady state value. In Fig. 5 (not shown) the impedance 22 is an FET (40) whose gate is controlled by the emitter circuit and whose source is connected to earth through a transistor (41) turned off by a monostable (61) triggered by the collector circuit to reduce overall gain during the overshoot period. The FET controls the feedback resistance of an op-amp (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3219773A GB1436627A (en) | 1973-07-05 | 1973-07-05 | Automatic gain control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3219773A GB1436627A (en) | 1973-07-05 | 1973-07-05 | Automatic gain control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1436627A true GB1436627A (en) | 1976-05-19 |
Family
ID=10334801
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3219773A Expired GB1436627A (en) | 1973-07-05 | 1973-07-05 | Automatic gain control circuit |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1436627A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2133943A (en) * | 1983-01-12 | 1984-08-01 | Ncr Co | Automatic gain control circuit |
| US4574202A (en) * | 1981-10-15 | 1986-03-04 | Tokyo Shibaura Denki Kabushiki Kaisha | Rectifier circuit with attack time variable in response to an input signal level |
-
1973
- 1973-07-05 GB GB3219773A patent/GB1436627A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4574202A (en) * | 1981-10-15 | 1986-03-04 | Tokyo Shibaura Denki Kabushiki Kaisha | Rectifier circuit with attack time variable in response to an input signal level |
| GB2133943A (en) * | 1983-01-12 | 1984-08-01 | Ncr Co | Automatic gain control circuit |
| US4528519A (en) * | 1983-01-12 | 1985-07-09 | Ncr Corporation | Automatic gain control |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| 746 | Register noted 'licences of right' (sect. 46/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19920705 |