JPS5769914A - Automatic gain controller - Google Patents

Automatic gain controller

Info

Publication number
JPS5769914A
JPS5769914A JP14561480A JP14561480A JPS5769914A JP S5769914 A JPS5769914 A JP S5769914A JP 14561480 A JP14561480 A JP 14561480A JP 14561480 A JP14561480 A JP 14561480A JP S5769914 A JPS5769914 A JP S5769914A
Authority
JP
Japan
Prior art keywords
voltage
capacitor
input signal
initial
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
JP14561480A
Other languages
Japanese (ja)
Inventor
Fuji Kanemasa
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP14561480A priority Critical patent/JPS5769914A/en
Publication of JPS5769914A publication Critical patent/JPS5769914A/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 without distortion of the input signal
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3005—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers

Abstract

PURPOSE:To reduce drawing time, by chaging a capacitor in an AGC circuit while an input signal is absent. CONSTITUTION:When an input signal Vin is absent, since the switch 23 turns on with zero output of a signal detection circuit 22, a capacitor 16 is charged to an initial voltage Vp, and a differential amplifier 19 takes a voltage which is a difference between the reference voltage Vs and the initial voltage Vp as an input, and a control voltage of its constant fold is given to a variable gain amplifier 12. When the input signal, Vin is given, the switch 23 turns off by the output of a signal detection circuit 22 to interrupt the supply of the initial voltage Vp. In this case, since the variable gain amplifier 12 is already in gain control, the initial output being the cause to overcharge of the capacitor 16 is limited and the drawing time can be reduced.
JP14561480A 1980-10-20 1980-10-20 Automatic gain controller Pending JPS5769914A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14561480A JPS5769914A (en) 1980-10-20 1980-10-20 Automatic gain controller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14561480A JPS5769914A (en) 1980-10-20 1980-10-20 Automatic gain controller

Publications (1)

Publication Number Publication Date
JPS5769914A true JPS5769914A (en) 1982-04-30

Family

ID=15389100

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14561480A Pending JPS5769914A (en) 1980-10-20 1980-10-20 Automatic gain controller

Country Status (1)

Country Link
JP (1) JPS5769914A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61161010A (en) * 1985-01-09 1986-07-21 Nec Corp Feedback type amplifier
JPH01221010A (en) * 1988-02-29 1989-09-04 Nec Corp Automatic power control circuit
JPH06244767A (en) * 1993-02-17 1994-09-02 Mitsubishi Electric Corp Automatic power amplifier control circuit
US5412341A (en) * 1993-10-28 1995-05-02 Motorola, Inc. Power control apparatus and method for a radio frequency amplifier

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61161010A (en) * 1985-01-09 1986-07-21 Nec Corp Feedback type amplifier
JPH01221010A (en) * 1988-02-29 1989-09-04 Nec Corp Automatic power control circuit
JPH06244767A (en) * 1993-02-17 1994-09-02 Mitsubishi Electric Corp Automatic power amplifier control circuit
US5412341A (en) * 1993-10-28 1995-05-02 Motorola, Inc. Power control apparatus and method for a radio frequency amplifier

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