GB1178232A - Improvements in or relating to gain control circuits. - Google Patents

Improvements in or relating to gain control circuits.

Info

Publication number
GB1178232A
GB1178232A GB628166A GB628166A GB1178232A GB 1178232 A GB1178232 A GB 1178232A GB 628166 A GB628166 A GB 628166A GB 628166 A GB628166 A GB 628166A GB 1178232 A GB1178232 A GB 1178232A
Authority
GB
United Kingdom
Prior art keywords
transistor
gain control
feb
resistor
drain
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
GB628166A
Inventor
Leslie Witcombe
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.)
EMI Ltd
Electrical and Musical Industries Ltd
Original Assignee
EMI Ltd
Electrical and Musical 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 EMI Ltd, Electrical and Musical Industries Ltd filed Critical EMI Ltd
Priority to GB628166A priority Critical patent/GB1178232A/en
Priority to DE19671512683 priority patent/DE1512683C3/en
Publication of GB1178232A publication Critical patent/GB1178232A/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
    • H03G1/0017—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal the device being at least one of the amplifying solid state elements of the amplifier
    • H03G1/0023—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal the device being at least one of the amplifying solid state elements of the amplifier in emitter-coupled or cascode amplifiers
    • 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
    • H03G1/0017—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal the device being at least one of the amplifying solid state elements of the amplifier
    • H03G1/0029—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal the device being at least one of the amplifying solid state elements of the amplifier using FETs
    • 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

Abstract

1,178,232. Gain control in transistor circuits. ELECTRIC & MUSICAL INDUSTRIES Ltd. 6 Feb., 1967 [12 Feb., 1966], No. 6281/66. Heading H3T. A gain control arrangement comprises a fieldeffect transistor with means for applying a gain control voltage to both drain and gate electrodes, with respect to the source electrode. A transistor R.F. amplifier is of the cascade type, comprising a field-effect transistor 1, to which the input signal is applied via tuned circuit 7, driving a junction transistor 5: output is taken from the collector of the latter via tuned circuit 6. A gain control voltage is applied via terminal 9 to the base of transistor 5 which, acting as an emitter-follower applies it to the drain, and in part, via potentiometer network 10, 11 and resistor 12 to the gate of field-effect transistor 1. Excess current of transistor 5 is by-passed by means of resistor 14.
GB628166A 1966-02-12 1966-02-12 Improvements in or relating to gain control circuits. Expired GB1178232A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB628166A GB1178232A (en) 1966-02-12 1966-02-12 Improvements in or relating to gain control circuits.
DE19671512683 DE1512683C3 (en) 1966-02-12 1967-02-09 Amplifier with controllable gain and a field effect transistor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB628166A GB1178232A (en) 1966-02-12 1966-02-12 Improvements in or relating to gain control circuits.

Publications (1)

Publication Number Publication Date
GB1178232A true GB1178232A (en) 1970-01-21

Family

ID=9811643

Family Applications (1)

Application Number Title Priority Date Filing Date
GB628166A Expired GB1178232A (en) 1966-02-12 1966-02-12 Improvements in or relating to gain control circuits.

Country Status (2)

Country Link
DE (1) DE1512683C3 (en)
GB (1) GB1178232A (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

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0213562B2 (en) * 1985-08-28 1997-11-12 Kabushiki Kaisha Toshiba Signal-processing circuit having a field-effect MOSFET and bipolar transistors
NL8800989A (en) * 1988-04-15 1989-11-01 At & T & Philips Telecomm CONTROL AMPLIFIER.
DE3814041A1 (en) * 1988-04-26 1989-11-09 Standard Elektrik Lorenz Ag CONTROLLABLE AC VOLTAGE 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

Also Published As

Publication number Publication date
DE1512683B2 (en) 1971-03-04
DE1512683A1 (en) 1969-08-07
DE1512683C3 (en) 1974-02-28

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