JPS5488017A - Gain control circuit - Google Patents

Gain control circuit

Info

Publication number
JPS5488017A
JPS5488017A JP15552977A JP15552977A JPS5488017A JP S5488017 A JPS5488017 A JP S5488017A JP 15552977 A JP15552977 A JP 15552977A JP 15552977 A JP15552977 A JP 15552977A JP S5488017 A JPS5488017 A JP S5488017A
Authority
JP
Japan
Prior art keywords
input signal
gain
signal
current
output
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
JP15552977A
Other languages
Japanese (ja)
Inventor
Fumio Ukigaya
Yukio Ono
Kazuhiro Sato
Naoki Ozawa
Kunio Seki
Hiroichi Sokei
Toru Mochizuki
Kazunori Onishi
Kotaro Wakui
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.)
Hitachi Denshi KK
Hitachi Ltd
Japan Broadcasting Corp
Original Assignee
Hitachi Denshi KK
Hitachi Ltd
Nippon Hoso Kyokai NHK
Japan Broadcasting Corp
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 Hitachi Denshi KK, Hitachi Ltd, Nippon Hoso Kyokai NHK, Japan Broadcasting Corp filed Critical Hitachi Denshi KK
Priority to JP15552977A priority Critical patent/JPS5488017A/en
Publication of JPS5488017A publication Critical patent/JPS5488017A/en
Pending legal-status Critical Current

Links

Landscapes

  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE: To improve the linearity of the gain-controlled output signal as well as to reduce the power consumption of the circuit by setting the output impedance of the constant voltage source to a fixed low level regardless of the input signal.
CONSTITUTION: The input signal to be supplied to the base of transistor TR11 is voltage-divided by the emitter output and via resistance 12 and 18 plus TR19 to be supplied to the base of TR20. Accordingly, the internal impedance of TR20 is varies by the input signal, and the collector current is controlled by the input signal with its scale proportional to the input signal current. Then the input signal level increases, and the internal impedance of TR20 is lowered by the increment of the signal current flowing through gain variable resistance 13, with no change of the emitter potential and current given to TR14. As a result, the power consumption can be reduced for the circuit without imparing the linearity of the gain-controlled output signal.
COPYRIGHT: (C)1979,JPO&Japio
JP15552977A 1977-12-26 1977-12-26 Gain control circuit Pending JPS5488017A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15552977A JPS5488017A (en) 1977-12-26 1977-12-26 Gain control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15552977A JPS5488017A (en) 1977-12-26 1977-12-26 Gain control circuit

Publications (1)

Publication Number Publication Date
JPS5488017A true JPS5488017A (en) 1979-07-12

Family

ID=15608053

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15552977A Pending JPS5488017A (en) 1977-12-26 1977-12-26 Gain control circuit

Country Status (1)

Country Link
JP (1) JPS5488017A (en)

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