GB884459A - Improvements in or relating to transistor amplifiers - Google Patents

Improvements in or relating to transistor amplifiers

Info

Publication number
GB884459A
GB884459A GB995358A GB995358A GB884459A GB 884459 A GB884459 A GB 884459A GB 995358 A GB995358 A GB 995358A GB 995358 A GB995358 A GB 995358A GB 884459 A GB884459 A GB 884459A
Authority
GB
United Kingdom
Prior art keywords
voltage
stage
resistor
going
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
GB995358A
Inventor
Herbert Rudolph Schlegel
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
Priority to GB995358A priority Critical patent/GB884459A/en
Publication of GB884459A publication Critical patent/GB884459A/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 without distortion of the input signal
    • 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

  • Amplifiers (AREA)

Abstract

884,459. Transistor amplifier circuits. TELEFUNKEN G.m.b.H. March 28, 1958, No. 9953/58. Class 40(6). In a multistage transistor amplifier gain control voltages are applied to adjacent stages in opposite polarity. As applied to a twostage I.F. amplifier, a negative-going A.G.C. voltage is applied from the detector C to the base of the first stage A and causes the voltage across the resistor 10 in the collector circuit to be positive-going. This voltage is applied to the base of the second stage B via resistor 9, so that as the output impedance of stage A increases that of B decreases, the desired decrease of gain being produced by impedance mismatch between the stages. A preceding stage may be controlled by the voltage across resistor 8.
GB995358A 1958-03-28 1958-03-28 Improvements in or relating to transistor amplifiers Expired GB884459A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB995358A GB884459A (en) 1958-03-28 1958-03-28 Improvements in or relating to transistor amplifiers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB995358A GB884459A (en) 1958-03-28 1958-03-28 Improvements in or relating to transistor amplifiers

Publications (1)

Publication Number Publication Date
GB884459A true GB884459A (en) 1961-12-13

Family

ID=9881810

Family Applications (1)

Application Number Title Priority Date Filing Date
GB995358A Expired GB884459A (en) 1958-03-28 1958-03-28 Improvements in or relating to transistor amplifiers

Country Status (1)

Country Link
GB (1) GB884459A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2227621A (en) * 1988-12-22 1990-08-01 Hitachi Ltd Gain control for two stage, Si/GaAs, amplifier

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2227621A (en) * 1988-12-22 1990-08-01 Hitachi Ltd Gain control for two stage, Si/GaAs, amplifier
US5029298A (en) * 1988-12-22 1991-07-02 Hitachi, Ltd. Transmitter circuit

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