GB920723A - Amplifier circuit - Google Patents

Amplifier circuit

Info

Publication number
GB920723A
GB920723A GB23796/60A GB2379660A GB920723A GB 920723 A GB920723 A GB 920723A GB 23796/60 A GB23796/60 A GB 23796/60A GB 2379660 A GB2379660 A GB 2379660A GB 920723 A GB920723 A GB 920723A
Authority
GB
United Kingdom
Prior art keywords
impedance
amplifier
transistor
gain
collector
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
GB23796/60A
Inventor
John James Marchant
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.)
Associated Electrical Industries Ltd
Original Assignee
Associated Electrical Industries Ltd
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 Associated Electrical Industries Ltd filed Critical Associated Electrical Industries Ltd
Priority to GB23796/60A priority Critical patent/GB920723A/en
Priority to FR867045A priority patent/FR1304046A/en
Publication of GB920723A publication Critical patent/GB920723A/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

Landscapes

  • Control Of Amplification And Gain Control (AREA)

Abstract

920,723. Automatic volume control. ASSOCIATED ELECTRICAL INDUSTRIES Ltd. June 19, 1961 [July 7, 1960], No. 23796/60. Class 40 (4). In an amplifier comprising a transistor with. impedances in its emitter and collector paths, the collector path impedance is varied in accordance with the magnitude of a control signal so as to vary the gain of the amplifier. It is stated that the gain of such a transistor amplifier is equal to the ratio of the collector and emitter impedances so that alteration of either will alter the amplifier's gain. In Fig. 2, the collector circuit impedance of transistor T comprises transformer TR and transistor T2 connected as shown, so that application of a control voltage Vc to the base of T2 will cause the emitter-base current to change hence changing the emitterbase impedance and consequently the collector circuit impedance of T, with a resultant change of the amplifier gain. Alternatively the control voltage Vc may be applied across a semiconductor diode D (Fig. 3) so as to bias the latter in its conducting direction. Variation of Vc alters the impedance of D and hence the effective impedance in the collector circuit and hence the gain of transistor T.
GB23796/60A 1960-07-07 1960-07-07 Amplifier circuit Expired GB920723A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB23796/60A GB920723A (en) 1960-07-07 1960-07-07 Amplifier circuit
FR867045A FR1304046A (en) 1960-07-07 1961-07-05 Variable gain transistor amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB23796/60A GB920723A (en) 1960-07-07 1960-07-07 Amplifier circuit

Publications (1)

Publication Number Publication Date
GB920723A true GB920723A (en) 1963-03-13

Family

ID=10201455

Family Applications (1)

Application Number Title Priority Date Filing Date
GB23796/60A Expired GB920723A (en) 1960-07-07 1960-07-07 Amplifier circuit

Country Status (2)

Country Link
FR (1) FR1304046A (en)
GB (1) GB920723A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1226649B (en) * 1965-08-21 1966-10-13 Te Ka De Fernmeldeapp G M B H Circuit arrangement for automatic gain control of a transistor amplifier
US3500222A (en) * 1966-09-19 1970-03-10 Hitachi Ltd Semiconductor amplifier gain control circuit

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2312086C3 (en) * 1972-03-30 1979-10-31 N.V. Philips' Gloeilampenfabrieken, Eindhoven (Niederlande) Signal transmission device with an amplitude and frequency dependent transmission function

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1226649B (en) * 1965-08-21 1966-10-13 Te Ka De Fernmeldeapp G M B H Circuit arrangement for automatic gain control of a transistor amplifier
US3500222A (en) * 1966-09-19 1970-03-10 Hitachi Ltd Semiconductor amplifier gain control circuit

Also Published As

Publication number Publication date
FR1304046A (en) 1962-09-21

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