JPS5678207A - Line amplifier - Google Patents

Line amplifier

Info

Publication number
JPS5678207A
JPS5678207A JP15418479A JP15418479A JPS5678207A JP S5678207 A JPS5678207 A JP S5678207A JP 15418479 A JP15418479 A JP 15418479A JP 15418479 A JP15418479 A JP 15418479A JP S5678207 A JPS5678207 A JP S5678207A
Authority
JP
Japan
Prior art keywords
feedback circuit
mubeta
local feedback
circuit
variable 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.)
Pending
Application number
JP15418479A
Other languages
Japanese (ja)
Inventor
Akira Ishikawa
Kazuyuki Odaka
Osamu Maeda
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP15418479A priority Critical patent/JPS5678207A/en
Publication of JPS5678207A publication Critical patent/JPS5678207A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/005—Control by a pilot signal

Landscapes

  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To make constant mubeta characteristics of a line amplifier, having an automatic pilot gain, without depending upon an automatic gain controller by complementarily varying the mubeta loop characteristics of a main feedback circuit and local feedback circuit according to variation in variable impedance. CONSTITUTION:The (mu) amplifying circuit 11 is provided with series local feedback and this local feedback circuit has interposed thermistor 12. Thermistor 14 of main feedback circuit 13, i.e. (beta) circuit and thermistor 12 of the local feedback circuit are supplied with control signals from one control amplifying circuit 15. Then, variable impedance is inserted into the local feedback circuit to form the local feedback circuit so that the variation of mubeta loop characteristics due to that of the variable impedance of the main feedback circuit will be complementary to the variation of mubeta loop characteristics due to that of the variable impedance of the local feedback circuit. Thus, the mubeta group characteristics of this line amplifier can be made nearly constant without reference to the automatic adjustment extent of the gain.
JP15418479A 1979-11-30 1979-11-30 Line amplifier Pending JPS5678207A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15418479A JPS5678207A (en) 1979-11-30 1979-11-30 Line amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15418479A JPS5678207A (en) 1979-11-30 1979-11-30 Line amplifier

Publications (1)

Publication Number Publication Date
JPS5678207A true JPS5678207A (en) 1981-06-27

Family

ID=15578665

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15418479A Pending JPS5678207A (en) 1979-11-30 1979-11-30 Line amplifier

Country Status (1)

Country Link
JP (1) JPS5678207A (en)

Similar Documents

Publication Publication Date Title
GB1535560A (en) Automatic control circuitry
JPS5678207A (en) Line amplifier
JPS57211835A (en) Automatic electric power controlling circuit for transmitter
JPS54100644A (en) Automatic gain control system
JPS5582519A (en) Amplifier
JPS644122A (en) Variable gain antenna
JPS5226145A (en) Automatic gain adjustment circuit
JPS54111709A (en) Automatic output control circuit
JPS5687907A (en) Adjuster of sound quality
JPS561608A (en) Multistep agc control system for automatic equalizer
JPS57199396A (en) Speaker input controlling circuit
JPS57157610A (en) Automatic gain controller
JPS5474601A (en) Hysteresis circuit of current control
JPS5561113A (en) Ultra-high frequency band negative feedback amplifier
JPS5769915A (en) Automatic gain control circuit
JPS5491034A (en) Variable attenuator circuit of voltage control type
JPS5762609A (en) Gain control amplifier
JPS5678209A (en) Control amplifier
JPS645110A (en) Variable attenuation circuit
JPS5469005A (en) Automatic gain adjusting circuit
JPS57162506A (en) Automatic gain controlling system
JPS55120232A (en) Repeater
JPS5745708A (en) Amplifying circuit
JPS5732109A (en) Automatic gain control amplifier
JPS55123217A (en) Automatic loudness correcting device