JPS57152740A - Optical receiving circuit - Google Patents

Optical receiving circuit

Info

Publication number
JPS57152740A
JPS57152740A JP56038438A JP3843881A JPS57152740A JP S57152740 A JPS57152740 A JP S57152740A JP 56038438 A JP56038438 A JP 56038438A JP 3843881 A JP3843881 A JP 3843881A JP S57152740 A JPS57152740 A JP S57152740A
Authority
JP
Japan
Prior art keywords
amplifier
circuit
agc
switches
signal
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
JP56038438A
Other languages
Japanese (ja)
Inventor
Takahiro Asai
Mitsuo Imai
Shigeo Okada
Yoshiki Ono
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 Cable Ltd
Original Assignee
Hitachi Cable 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 Hitachi Cable Ltd filed Critical Hitachi Cable Ltd
Priority to JP56038438A priority Critical patent/JPS57152740A/en
Publication of JPS57152740A publication Critical patent/JPS57152740A/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
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3084—Automatic control in amplifiers having semiconductor devices in receivers or transmitters for electromagnetic waves other than radiowaves, e.g. lightwaves

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of Amplification And Gain Control (AREA)
  • Optical Communication System (AREA)

Abstract

PURPOSE:To constitute an optical receiving circuit having the automatic gain control function of a high linearity, by changing the gain of an amplifier by plural switches and fixed resistances. CONSTITUTION:A photocurrent induced in a photodiode 1 is amplified by a low noise amplifier 2, and the output is taken out as the final output through an AGC amplifier 3, a buffer amplifier 6, and a pilot signal eliminating circuit 7. A part of the output of the buffer amplifier 6 is led to a signal amplitude detecting circuit, and a DC voltage proportional to the amplitude of the input signal is given to an AGC circuit 5. The AGC circuit 5 generates n-bit turn-on/off signal for gain control to turn on and off switches 130, 131-13n-1, and the resultant resistance value of resistors 120, 121-12n-1 is switched to 2 kinds of value by the combination of turning-on and off of these switches to set the amplification degree of the AGC amplifier to a prescribed value.
JP56038438A 1981-03-17 1981-03-17 Optical receiving circuit Pending JPS57152740A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56038438A JPS57152740A (en) 1981-03-17 1981-03-17 Optical receiving circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56038438A JPS57152740A (en) 1981-03-17 1981-03-17 Optical receiving circuit

Publications (1)

Publication Number Publication Date
JPS57152740A true JPS57152740A (en) 1982-09-21

Family

ID=12525301

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56038438A Pending JPS57152740A (en) 1981-03-17 1981-03-17 Optical receiving circuit

Country Status (1)

Country Link
JP (1) JPS57152740A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62139137U (en) * 1986-02-25 1987-09-02
US5617240A (en) * 1994-02-25 1997-04-01 Thomson-Csf Automatic gain control method and device for receiving circuits
CN101834661A (en) * 2010-04-02 2010-09-15 中国科学院半导体研究所 LED (Light Emitting Diode) white light receiving and amplifying circuit for communication

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS555526A (en) * 1978-06-27 1980-01-16 Matsushita Electric Ind Co Ltd Automatic level set unit of digital type
JPS5535563A (en) * 1978-09-06 1980-03-12 Fujitsu Ltd Light reception circuit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS555526A (en) * 1978-06-27 1980-01-16 Matsushita Electric Ind Co Ltd Automatic level set unit of digital type
JPS5535563A (en) * 1978-09-06 1980-03-12 Fujitsu Ltd Light reception circuit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62139137U (en) * 1986-02-25 1987-09-02
US5617240A (en) * 1994-02-25 1997-04-01 Thomson-Csf Automatic gain control method and device for receiving circuits
CN101834661A (en) * 2010-04-02 2010-09-15 中国科学院半导体研究所 LED (Light Emitting Diode) white light receiving and amplifying circuit for communication

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