JPS55114917A - Agc circuit - Google Patents

Agc circuit

Info

Publication number
JPS55114917A
JPS55114917A JP2300079A JP2300079A JPS55114917A JP S55114917 A JPS55114917 A JP S55114917A JP 2300079 A JP2300079 A JP 2300079A JP 2300079 A JP2300079 A JP 2300079A JP S55114917 A JPS55114917 A JP S55114917A
Authority
JP
Japan
Prior art keywords
circuit
signal
voltage
control
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.)
Granted
Application number
JP2300079A
Other languages
Japanese (ja)
Other versions
JPS6136604B2 (en
Inventor
Yoshio Ogushi
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 JP2300079A priority Critical patent/JPS55114917A/en
Publication of JPS55114917A publication Critical patent/JPS55114917A/en
Publication of JPS6136604B2 publication Critical patent/JPS6136604B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/45—Differential amplifiers
    • H03F3/45071—Differential amplifiers with semiconductor devices only
    • H03F3/45479—Differential amplifiers with semiconductor devices only characterised by the way of common mode signal rejection

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)

Abstract

PURPOSE:To make a pilot signal, etc., needless to simplify a circuit constitution by detecting the DC light level in a light receiving unit and giving AGC. CONSTITUTION:The receiving signal of photo diode 1 is subjected to wideband amplification in 7 and is supplied to control circuit 8. Circuit 8 attenuates the input signal by a quantity corresponding to the control signal voltage and outputs the input signal, and an output signal is obtained through amplifier 4. At this time, the output DC voltage of circuit 8 is compared with reference voltage Es by control voltage generation circuit 9, and error components between both voltages are amplified and are applied to circuit 8 as a control voltage. Consequently, the output DC level of circuit 8 becomes always fixed for change of the input level.
JP2300079A 1979-02-27 1979-02-27 Agc circuit Granted JPS55114917A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2300079A JPS55114917A (en) 1979-02-27 1979-02-27 Agc circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2300079A JPS55114917A (en) 1979-02-27 1979-02-27 Agc circuit

Publications (2)

Publication Number Publication Date
JPS55114917A true JPS55114917A (en) 1980-09-04
JPS6136604B2 JPS6136604B2 (en) 1986-08-19

Family

ID=12098233

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2300079A Granted JPS55114917A (en) 1979-02-27 1979-02-27 Agc circuit

Country Status (1)

Country Link
JP (1) JPS55114917A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0283414A (en) * 1988-09-20 1990-03-23 Ngk Insulators Ltd Optic/electric transducer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0283414A (en) * 1988-09-20 1990-03-23 Ngk Insulators Ltd Optic/electric transducer

Also Published As

Publication number Publication date
JPS6136604B2 (en) 1986-08-19

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