GB817417A - Automatic gain control arrangements for transistor amplifiers - Google Patents

Automatic gain control arrangements for transistor amplifiers

Info

Publication number
GB817417A
GB817417A GB1459757A GB1459757A GB817417A GB 817417 A GB817417 A GB 817417A GB 1459757 A GB1459757 A GB 1459757A GB 1459757 A GB1459757 A GB 1459757A GB 817417 A GB817417 A GB 817417A
Authority
GB
United Kingdom
Prior art keywords
transistor
diode
automatic gain
gain control
input impedance
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
GB1459757A
Inventor
Charles Thomas Scully
Peter Norman
Everard John Edward Smith
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
Filing date
Publication date
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB817417A publication Critical patent/GB817417A/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

Landscapes

  • Control Of Amplification And Gain Control (AREA)

Abstract

817,417. Transistor amplifiers. STANDARD TELEPHONES & CABLES Ltd. May 8, 1957 , No. 14597/57. Class 40 (6). In a transistor amplifier provided with automatic gain control, means comprising a pointcontact diode 10 connected in parallel with the input circuit of the transistor 1 are provided for rendering the input impedance of the amplifier substantially independent of variations of gain. Gain-control is effected by the application of a control current derived from the rectified output of the transistor 1 to its base electrode. Both the diode 10 and the diode provided by the emitter and base of the transistor 1 are connected to conduct in the same direction; thus as the input impedance of the transistor rises due to an increase in the control current supplied to its base, its emitter potential rises so that the impedance of diode 10 falls, thus tending to maintain the input impedance as seen across the terminals 12, 13 constant.
GB1459757A 1957-05-08 Automatic gain control arrangements for transistor amplifiers Expired GB817417A (en)

Publications (1)

Publication Number Publication Date
GB817417A true GB817417A (en) 1959-07-29

Family

ID=1730865

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1459757A Expired GB817417A (en) 1957-05-08 Automatic gain control arrangements for transistor amplifiers

Country Status (1)

Country Link
GB (1) GB817417A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1166274B (en) * 1960-08-30 1964-03-26 Nippon Electric Co Adjustable transistor amplifier
DE1174365B (en) * 1961-01-27 1964-07-23 Int Standard Electric Corp Circuit arrangement for a tactile transistor amplifier stage
GB2268646A (en) * 1992-06-30 1994-01-12 Texas Instruments Ltd Using feedback to render a transistor impedance insensitive to a gain control voltage

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1166274B (en) * 1960-08-30 1964-03-26 Nippon Electric Co Adjustable transistor amplifier
DE1174365B (en) * 1961-01-27 1964-07-23 Int Standard Electric Corp Circuit arrangement for a tactile transistor amplifier stage
GB2268646A (en) * 1992-06-30 1994-01-12 Texas Instruments Ltd Using feedback to render a transistor impedance insensitive to a gain control voltage

Similar Documents

Publication Publication Date Title
GB1265157A (en)
GB766744A (en) Semi-conductor signal receiving system
ES397069A1 (en) Synchronous detector control
GB1469990A (en) Gain control circuit
GB817417A (en) Automatic gain control arrangements for transistor amplifiers
ES249698A1 (en) Push-pull amplifier circuits
GB756017A (en) Improvements in gain control circuits for semiconductor amplifiers
US3199041A (en) D.c. transistor amplifier including a zener diode
GB875063A (en) Improvements in or relating to signal expanders
GB909776A (en) A transistor amplifier with gain control
GB1372794A (en) Automatic gain control circuits
GB802307A (en) Improvements in or relating to electrical circuits utilizing transistors
GB1070661A (en) Automatic gain control arrangements in transistor amplifiers
GB870094A (en) Improvements in constant-current circuit arrangements
JPS5779715A (en) Envelope detection circuit
ES265896A1 (en) Frequency converter
GB923428A (en) Circuit arrangement for controlling the amplification in a transistor amplifier stage
GB763819A (en) Improvements in or relating to transistor amplifiers
GB1288880A (en)
ES279238A1 (en) Improvements in amplifier circuits
JPS5845850B2 (en) Kukeihanohakouchigen Cairo
GB843366A (en) Improvements in and relating to transistor amplifiers
ES286548A1 (en) Improvements in self-regulated circuits of high voltage supply (Machine-translation by Google Translate, not legally binding)
GB816902A (en) Automatic gain control circuit
ES275254A1 (en) Multiple function circuit