JPS5583311A - Agc circuit - Google Patents

Agc circuit

Info

Publication number
JPS5583311A
JPS5583311A JP16085178A JP16085178A JPS5583311A JP S5583311 A JPS5583311 A JP S5583311A JP 16085178 A JP16085178 A JP 16085178A JP 16085178 A JP16085178 A JP 16085178A JP S5583311 A JPS5583311 A JP S5583311A
Authority
JP
Japan
Prior art keywords
output
amplifier
circuit
comparator
switch
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
JP16085178A
Other languages
Japanese (ja)
Inventor
Haruo Taguchi
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 JP16085178A priority Critical patent/JPS5583311A/en
Publication of JPS5583311A publication Critical patent/JPS5583311A/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
    • H03G3/001—Digital control of analog signals
    • 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

PURPOSE:To simplify amplitude measurement by providing an AGC circuit with a detection circuit which detects the output of a variable gain amplifier, a comparator circuit which compares its output with a reference voltage, a reversible counter which provides addition or subtraction according to the output of the comparator, and a D/A converter. CONSTITUTION:An AGC circuit consists of variable gain amplifier 1, detector 2 for output level detection, direct-current amplifier 3 for AGC loop feedback, reference voltage input terminal 4, comparator 5, reversible counter 6, D/A converter 7, and switch S. In this constitution, switch S is closed to make detector 2 detect the output level of amplifier 1 and comparator 5 makes a comparison between a detection output and reference voltage to make counter 6 increase or decrease its count value, which applied to amplifier 1 via converter 7, thereby exercising gain control. With switch S opened next, an AGC loop is turned OFF to fix a gain when switch S is closed. Consequently, the ON-OFF switching of AGC and a gain adjustment can be done by one stage, so that the circuit will be simplified.
JP16085178A 1978-12-19 1978-12-19 Agc circuit Pending JPS5583311A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16085178A JPS5583311A (en) 1978-12-19 1978-12-19 Agc circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16085178A JPS5583311A (en) 1978-12-19 1978-12-19 Agc circuit

Publications (1)

Publication Number Publication Date
JPS5583311A true JPS5583311A (en) 1980-06-23

Family

ID=15723762

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16085178A Pending JPS5583311A (en) 1978-12-19 1978-12-19 Agc circuit

Country Status (1)

Country Link
JP (1) JPS5583311A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0276309A (en) * 1988-09-12 1990-03-15 Kokusai Syst Kk Automatic gain control circuit
US6038432A (en) * 1997-10-07 2000-03-14 Fujitsu Limited Automatic transmission power control circuit
KR100325556B1 (en) * 1998-02-02 2002-04-17 아끼구사 나오유끼 An automatic gain control circuit

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51120156A (en) * 1975-04-14 1976-10-21 Toshiba Corp Agc circuit
JPS524217A (en) * 1975-06-20 1977-01-13 Hitachi Ltd Automatic gain adjust play back unit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51120156A (en) * 1975-04-14 1976-10-21 Toshiba Corp Agc circuit
JPS524217A (en) * 1975-06-20 1977-01-13 Hitachi Ltd Automatic gain adjust play back unit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0276309A (en) * 1988-09-12 1990-03-15 Kokusai Syst Kk Automatic gain control circuit
US6038432A (en) * 1997-10-07 2000-03-14 Fujitsu Limited Automatic transmission power control circuit
KR100325556B1 (en) * 1998-02-02 2002-04-17 아끼구사 나오유끼 An automatic gain control circuit

Similar Documents

Publication Publication Date Title
CA2097729A1 (en) Power control device wherein a bias voltage in level detection is given a constant difference from a detected voltage
JPS6417504A (en) High dynamics amplifier stage with strain detection function
GB1252536A (en)
JPS5583311A (en) Agc circuit
JPS54158208A (en) Auto-muting circuit
JPS5726940A (en) Agc circuit
JPS5443448A (en) Compressor
JPS5614709A (en) Agc circuit
JPS563578A (en) Inverter device
JPS5592009A (en) Variable gain amplifier
JPS5582535A (en) Automatic threshold value control circuit
JPS5514780A (en) Active filter
JPS5691514A (en) Agc system
JPS5583352A (en) Noise reduction unit on signal compression and expansion system
KR900001441Y1 (en) Automatic gain control circuit
JPS57188163A (en) Signal discriminator
JPS5742218A (en) Delay automatic gain control circuit
JPS56166773A (en) Controlling device for current type inverter circuit
JPS5455109A (en) Controller for signal level
JPS56104539A (en) Oscillation/wave detection device
GB1480437A (en) Adaptive current regulator
JPS5464955A (en) Amplifier circuit
JPS57116402A (en) Automatic volume controller
JPS5446452A (en) Automatic gain control amplifier
JPS57157640A (en) Receiver