GB1084833A - Improvements in or relating to gain control of transistor amplifiers - Google Patents

Improvements in or relating to gain control of transistor amplifiers

Info

Publication number
GB1084833A
GB1084833A GB4597164A GB4597164A GB1084833A GB 1084833 A GB1084833 A GB 1084833A GB 4597164 A GB4597164 A GB 4597164A GB 4597164 A GB4597164 A GB 4597164A GB 1084833 A GB1084833 A GB 1084833A
Authority
GB
United Kingdom
Prior art keywords
transistor
gain
stage
gain control
relating
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
GB4597164A
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.)
Telefunken Patentverwertungs GmbH
Original Assignee
Telefunken Patentverwertungs GmbH
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 Telefunken Patentverwertungs GmbH filed Critical Telefunken Patentverwertungs GmbH
Publication of GB1084833A publication Critical patent/GB1084833A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3052—Automatic control in amplifiers having semiconductor devices in bandpass amplifiers (H.F. or I.F.) or in frequency-changers used in a (super)heterodyne receiver
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G5/00—Tone control or bandwidth control in amplifiers
    • H03G5/16—Automatic control
    • H03G5/24—Automatic control in frequency-selective amplifiers
    • H03G5/28—Automatic control in frequency-selective amplifiers having semiconductor devices

Landscapes

  • Control Of Amplification And Gain Control (AREA)
  • Amplifiers (AREA)

Abstract

1,084,833. Gain control of transistor amplifiers. TELEFUNKEN PATENTVERWERTUNGS G.m.b.H. Nov. 11, 1964 [Nov. 12, 1963], No. 45971/64. Heading H3T. Automatic gain control of one stage of a selective transistor amplifier is of a type which reduces the gain of the transistor by reducing its collector current and of an adjacent stage is of a type which reduces the gain of the transistor by increasing its collector current. By this means changes in input and output impedance may be made to cancel so that the bandwidth remains constant or varies in a desired manner. To avoid cross-modulation in a preceding stage it may comprise two transistors (Fig. 2, not shown) having their inputs in antiphase and their outputs in parallel so that the two outputs cancel when the stage is balanced. The gain of one transistor is then controlled to vary the extent of cancellation.
GB4597164A 1963-11-12 1964-11-11 Improvements in or relating to gain control of transistor amplifiers Expired GB1084833A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DET25054A DE1202338B (en) 1963-11-12 1963-11-12 Multi-stage selective transistor amplifier

Publications (1)

Publication Number Publication Date
GB1084833A true GB1084833A (en) 1967-09-27

Family

ID=7551824

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4597164A Expired GB1084833A (en) 1963-11-12 1964-11-11 Improvements in or relating to gain control of transistor amplifiers

Country Status (2)

Country Link
DE (1) DE1202338B (en)
GB (1) GB1084833A (en)

Also Published As

Publication number Publication date
DE1202338B (en) 1965-10-07

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