GB923428A - Circuit arrangement for controlling the amplification in a transistor amplifier stage - Google Patents
Circuit arrangement for controlling the amplification in a transistor amplifier stageInfo
- Publication number
- GB923428A GB923428A GB300062D GB300062D GB923428A GB 923428 A GB923428 A GB 923428A GB 300062 D GB300062 D GB 300062D GB 300062 D GB300062 D GB 300062D GB 923428 A GB923428 A GB 923428A
- Authority
- GB
- United Kingdom
- Prior art keywords
- rectifier
- transistor
- control
- gain
- amplification
- 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
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G1/00—Details of arrangements for controlling amplification
- H03G1/0005—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal
- H03G1/0035—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using continuously variable impedance elements
- H03G1/0052—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using continuously variable impedance elements using diodes
Landscapes
- Amplifiers (AREA)
- Control Of Amplification And Gain Control (AREA)
Abstract
923,428. Automatic volume control. STANDARD TELEPHONES & CABLES Ltd. Jan. 26, 1962 [Jan. 27, 1961], No. 3000/62. Class 40 (4). [Also in Group XL (c)] A common emitter transistor amplifier T has a rectifier D 1 connected across the signal input circuit and has the gain controlled by a potential applied to the transistor and the rectifier through a further rectifier D 2 . Rectifier D 1 becomes progressively more conductive as the gain of the transistor is reduced by the control voltage so that when the transistor is cut-off the rectifier maintains the input impedance at a value more appropriate to the preceding stage. Rectifier D 2 isolates the control potential source from the transistor at full gain. The control potential may be derived from speech voltages through a rectifier, amplifier and a rate of change of control modifying network. Preferably the potential source has an impedance equal to the forward impedance of rectifier D 2 .
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT68561A AT227306B (en) | 1961-01-27 | 1961-01-27 | Circuit arrangement for regulating or sampling the gain in a transistor stage |
Publications (1)
Publication Number | Publication Date |
---|---|
GB923428A true GB923428A (en) | 1963-04-10 |
Family
ID=3497106
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB300062D Expired GB923428A (en) | 1961-01-27 | 1962-01-26 | Circuit arrangement for controlling the amplification in a transistor amplifier stage |
Country Status (3)
Country | Link |
---|---|
AT (1) | AT227306B (en) |
DE (1) | DE1174365B (en) |
GB (1) | GB923428A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2157906A (en) * | 1984-04-18 | 1985-10-30 | Alps Electric Co Ltd | High-frequency switching circuit |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1276737B (en) * | 1966-03-01 | 1968-09-05 | Graetz Kommanditgesellschaft | Circuit arrangement for up and down regulation of a two-stage transistor amplifier |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB817417A (en) * | 1957-05-08 | 1959-07-29 | Standard Telephones Cables Ltd | Automatic gain control arrangements for transistor amplifiers |
US2898411A (en) * | 1953-12-07 | 1959-08-04 | Gen Electric | Gain control circuit for semiconductor amplifiers |
-
1961
- 1961-01-27 AT AT68561A patent/AT227306B/en active
-
1962
- 1962-01-25 DE DEJ21206A patent/DE1174365B/en active Pending
- 1962-01-26 GB GB300062D patent/GB923428A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2157906A (en) * | 1984-04-18 | 1985-10-30 | Alps Electric Co Ltd | High-frequency switching circuit |
Also Published As
Publication number | Publication date |
---|---|
DE1174365B (en) | 1964-07-23 |
AT227306B (en) | 1963-05-10 |
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