GB1329394A - Switched gain constant frequency response amplifier - Google Patents

Switched gain constant frequency response amplifier

Info

Publication number
GB1329394A
GB1329394A GB488772A GB488772A GB1329394A GB 1329394 A GB1329394 A GB 1329394A GB 488772 A GB488772 A GB 488772A GB 488772 A GB488772 A GB 488772A GB 1329394 A GB1329394 A GB 1329394A
Authority
GB
United Kingdom
Prior art keywords
amplifier
frequency response
gain
feb
conduction
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
GB488772A
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.)
Nash and Harrison Ltd
Original Assignee
Nash and Harrison 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 Nash and Harrison Ltd filed Critical Nash and Harrison Ltd
Publication of GB1329394A publication Critical patent/GB1329394A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/72—Gated amplifiers, i.e. amplifiers which are rendered operative or inoperative by means of a control signal
    • 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
    • H03G1/007—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using continuously variable impedance elements using FET type devices

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Amplification And Gain Control (AREA)
  • Amplifiers (AREA)

Abstract

1329394 Gain control arrangements NASH & HARRISON Ltd 2 Feb 1972 [3 Feb 1971] 4887/72 Heading H3T An operatinal amplifier comprises D.C. amplifier means, frequency response compensation means connected therewith, feedback means including means for matching the amplifier gain between two levels, and frequency response control means responsive to the gain switching means to change the frequency response compensation means so that the amplifier frequency response is substantially the same and oscillation of the D.C. amplifier is prevented at both levels. The gain of amplifier A is switched by means of a control voltage applied to the gate of field-effect transistor Q5, conduction in the source to drain path of which brings resistor R25 into the feedback network of the amplifier. The control voltage is also applied to the base of a transistor Q1, the collector voltage of which controls the gate bias of a further field effect transistor Q2, conduction in the source to drain path of which short-circuits capacitor C7 in the further feedback network comprising capacitors C5, C7 and resistors R11, R12.
GB488772A 1971-02-03 1972-02-02 Switched gain constant frequency response amplifier Expired GB1329394A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA104404 1971-02-03

Publications (1)

Publication Number Publication Date
GB1329394A true GB1329394A (en) 1973-09-05

Family

ID=4088659

Family Applications (1)

Application Number Title Priority Date Filing Date
GB488772A Expired GB1329394A (en) 1971-02-03 1972-02-02 Switched gain constant frequency response amplifier

Country Status (2)

Country Link
CA (1) CA913734A (en)
GB (1) GB1329394A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2261334A (en) * 1991-11-08 1993-05-12 Northern Telecom Ltd Hf amplifier bandwidth control

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0851318A (en) * 1994-08-08 1996-02-20 Oki Electric Ind Co Ltd Variable gain circuit and integrated circuit therefor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2261334A (en) * 1991-11-08 1993-05-12 Northern Telecom Ltd Hf amplifier bandwidth control

Also Published As

Publication number Publication date
CA913734A (en) 1972-10-31

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee