GB923428A - Circuit arrangement for controlling the amplification in a transistor amplifier stage - Google Patents

Circuit arrangement for controlling the amplification in a transistor amplifier stage

Info

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
Application number
GB300062D
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB923428A publication Critical patent/GB923428A/en
Expired legal-status Critical Current

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 .
GB300062D 1961-01-27 1962-01-26 Circuit arrangement for controlling the amplification in a transistor amplifier stage Expired GB923428A (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Cited By (1)

* Cited by examiner, † Cited by third party
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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