GB853870A - Improvements in or relating to amplifiers employing transistors - Google Patents

Improvements in or relating to amplifiers employing transistors

Info

Publication number
GB853870A
GB853870A GB1257757A GB1257757A GB853870A GB 853870 A GB853870 A GB 853870A GB 1257757 A GB1257757 A GB 1257757A GB 1257757 A GB1257757 A GB 1257757A GB 853870 A GB853870 A GB 853870A
Authority
GB
United Kingdom
Prior art keywords
amplifier
resistor
relating
april
control
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
GB1257757A
Inventor
Ludwig Joseph Herbst
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.)
British Telecommunications PLC
British Telecommunications Research Ltd
Original Assignee
British Telecommunications PLC
British Telecommunications Research 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 British Telecommunications PLC, British Telecommunications Research Ltd filed Critical British Telecommunications PLC
Priority to GB1257757A priority Critical patent/GB853870A/en
Publication of GB853870A publication Critical patent/GB853870A/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
    • H03G1/0035—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using continuously variable impedance elements
    • H03G1/0052—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using continuously variable impedance elements using diodes

Landscapes

  • Control Of Amplification And Gain Control (AREA)

Abstract

853,870. Transistor amplifying circuits. BRITISH TELECOMMUNICATIONS RESEARCH Ltd. April 11, 1958 [April 17, 1957], No. l2577/57. Class 40(6). The gain of a transistor amplifier is controlled by variation of the amount of negative feedback. As applied to automatic gain control in an I.F. amplifier, the D.C. output of detector VT2 is smoothed by network C and used to control the resistance of a junction diode MR1 which forms for A.C. a variable shunt across the emitter circuit resistor R1 of I.F. amplifier VT1. For manual control, the resistance of diode MR1 may be controlled from a potentiometer across the power supply (Fig. 1, not shown), or alternatively from the voltage across resistor R1 by connecting a variable resistor across condenser Cl (Fig. 2, not shown).
GB1257757A 1957-04-17 1957-04-17 Improvements in or relating to amplifiers employing transistors Expired GB853870A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1257757A GB853870A (en) 1957-04-17 1957-04-17 Improvements in or relating to amplifiers employing transistors

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1257757A GB853870A (en) 1957-04-17 1957-04-17 Improvements in or relating to amplifiers employing transistors

Publications (1)

Publication Number Publication Date
GB853870A true GB853870A (en) 1960-11-09

Family

ID=10007209

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1257757A Expired GB853870A (en) 1957-04-17 1957-04-17 Improvements in or relating to amplifiers employing transistors

Country Status (1)

Country Link
GB (1) GB853870A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1132975B (en) * 1960-11-23 1962-07-12 Wolfgang Assmann G M B H Control circuit for transistorized amplifiers
US3339147A (en) * 1965-01-14 1967-08-29 Kollsman Instr Corp A-c amplifier linearly controlled by a d-c signal
FR2126342A1 (en) * 1971-02-23 1972-10-06 Int Standard Electric Corp
JPS48112393U (en) * 1972-03-30 1973-12-22

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1132975B (en) * 1960-11-23 1962-07-12 Wolfgang Assmann G M B H Control circuit for transistorized amplifiers
US3339147A (en) * 1965-01-14 1967-08-29 Kollsman Instr Corp A-c amplifier linearly controlled by a d-c signal
FR2126342A1 (en) * 1971-02-23 1972-10-06 Int Standard Electric Corp
JPS48112393U (en) * 1972-03-30 1973-12-22

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