GB840090A - Improvements relating to transistor amplifiers - Google Patents

Improvements relating to transistor amplifiers

Info

Publication number
GB840090A
GB840090A GB25048/56A GB2504856A GB840090A GB 840090 A GB840090 A GB 840090A GB 25048/56 A GB25048/56 A GB 25048/56A GB 2504856 A GB2504856 A GB 2504856A GB 840090 A GB840090 A GB 840090A
Authority
GB
United Kingdom
Prior art keywords
circuits
tuned
amplifier
aug
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
GB25048/56A
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 AG
Original Assignee
Telefunken AG
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 AG filed Critical Telefunken AG
Publication of GB840090A publication Critical patent/GB840090A/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
    • 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

Landscapes

  • Control Of Amplification And Gain Control (AREA)

Abstract

840,090. Transistor amplifier circuits. TELEFUNKEN G.m.b.H. Aug. 16, 1956 [Aug. 16, 1955], No. 25048/56. Class 40 (6). In a transistor amplifier comprising at least two tuned coupling circuits and means for controlling the gain, the tuned circuits are de-tuned in opposite directions to provide the desired band-width and positive feed-back is provided to maintain the bandwidth constant as the gain of the amplifier is varied. The Figure shows an I.F. amplifier in which the circuits 1 and 3 are de-tuned in opposite directions by 2 kc/s. and in which the positive feed-back is provided through a capacitor 7 or through a suitable phase-changing network. The collector electrodes of the transistors are connected to taps on the tuned circuit so as to improve the matching and neutralizing circuits may be provided if necessary.
GB25048/56A 1955-08-16 1956-08-16 Improvements relating to transistor amplifiers Expired GB840090A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE840090X 1955-08-16

Publications (1)

Publication Number Publication Date
GB840090A true GB840090A (en) 1960-07-06

Family

ID=6762376

Family Applications (1)

Application Number Title Priority Date Filing Date
GB25048/56A Expired GB840090A (en) 1955-08-16 1956-08-16 Improvements relating to transistor amplifiers

Country Status (1)

Country Link
GB (1) GB840090A (en)

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