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GB1459774A - Gain control circuit - Google Patents

Gain control circuit

Info

Publication number
GB1459774A
GB1459774A GB1078976A GB1078976A GB1459774A GB 1459774 A GB1459774 A GB 1459774A GB 1078976 A GB1078976 A GB 1078976A GB 1078976 A GB1078976 A GB 1078976A GB 1459774 A GB1459774 A GB 1459774A
Authority
GB
United Kingdom
Prior art keywords
base
gain control
control circuit
impedance
gain
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
GB1078976A
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.)
Sony Corp
Original Assignee
Sony Corp
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 Sony Corp filed Critical Sony Corp
Priority to GB1078976A priority Critical patent/GB1459774A/en
Publication of GB1459774A publication Critical patent/GB1459774A/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
    • H03G1/0082—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using continuously variable impedance elements using bipolar transistor-type devices

Landscapes

  • Control Of Amplification And Gain Control (AREA)

Abstract

1459774 Gain control of amplifiers SONY CORP 12 Dec 1973 10789/73 Divided out of 1459773 Heading H3T In a cascade amplifier comprising transistors Q1, Q2, Q3, gain is controlled by a voltage Vc applied to the base of Q1 to vary the forward bias of the base-collector junction of Q1 and thus its base-to-collector impedance. The sensitivity of the control may be varied by adding a resistor in series with the base circuit and increase of the impedance of Q3 and thus the noise rejection can be effected by adding R6. Other stages may be controlled via unit 6.
GB1078976A 1973-12-12 1973-12-12 Gain control circuit Expired GB1459774A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1078976A GB1459774A (en) 1973-12-12 1973-12-12 Gain control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1078976A GB1459774A (en) 1973-12-12 1973-12-12 Gain control circuit

Publications (1)

Publication Number Publication Date
GB1459774A true GB1459774A (en) 1976-12-31

Family

ID=9974294

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1078976A Expired GB1459774A (en) 1973-12-12 1973-12-12 Gain control circuit

Country Status (1)

Country Link
GB (1) GB1459774A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4344043A (en) 1980-04-23 1982-08-10 Rca Corporation Variable load impedance gain-controlled amplifier

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4344043A (en) 1980-04-23 1982-08-10 Rca Corporation Variable load impedance gain-controlled amplifier

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Legal Events

Date Code Title Description
PS Patent sealed
PE20 Patent expired after termination of 20 years

Effective date: 19931211