JPS554182A - Photo reception circuit - Google Patents

Photo reception circuit

Info

Publication number
JPS554182A
JPS554182A JP7770278A JP7770278A JPS554182A JP S554182 A JPS554182 A JP S554182A JP 7770278 A JP7770278 A JP 7770278A JP 7770278 A JP7770278 A JP 7770278A JP S554182 A JPS554182 A JP S554182A
Authority
JP
Japan
Prior art keywords
amplifier
voltage
input terminal
output
photo
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
JP7770278A
Other languages
Japanese (ja)
Other versions
JPS5850456B2 (en
Inventor
Mamoru Endo
Muna Suga
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP53077702A priority Critical patent/JPS5850456B2/en
Publication of JPS554182A publication Critical patent/JPS554182A/en
Publication of JPS5850456B2 publication Critical patent/JPS5850456B2/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/60—Receivers
    • H04B10/66—Non-coherent receivers, e.g. using direct detection
    • H04B10/69—Electrical arrangements in the receiver
    • H04B10/695—Arrangements for optimizing the decision element in the receiver, e.g. by using automatic threshold control

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)
  • Manipulation Of Pulses (AREA)
  • Electronic Switches (AREA)

Abstract

PURPOSE:To make it possible to obtain a stable discrimination level and to receive a photo signal with a few errors by a simple constitution when converting a digital photo signal received into an electric signal. CONSTITUTION:The output of photo detecting element 11 on which an input photo signal is incident is supplied to positive input terminal (+) of amplifier 13 with both negative and positive terminals and a voltage at the negative input terminal side of amplifier 13 is used for the reference voltage of comparator 16, because this voltage of amplifier 13 where output voltage Vout is fed back to negative input terminal (-) by resistance 15 becomes equal to that at the output terminal with no input supplied to the positive input terminal. Therefore, even if amplifier 16 varies in output voltage due to variation in power voltage or temperature, the reference voltage of comparator 16 follows up the variation of the output voltage of amplifier 13, so that the input photo signal can be received and discriminated stably.
JP53077702A 1978-06-27 1978-06-27 optical receiver circuit Expired JPS5850456B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP53077702A JPS5850456B2 (en) 1978-06-27 1978-06-27 optical receiver circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP53077702A JPS5850456B2 (en) 1978-06-27 1978-06-27 optical receiver circuit

Publications (2)

Publication Number Publication Date
JPS554182A true JPS554182A (en) 1980-01-12
JPS5850456B2 JPS5850456B2 (en) 1983-11-10

Family

ID=13641223

Family Applications (1)

Application Number Title Priority Date Filing Date
JP53077702A Expired JPS5850456B2 (en) 1978-06-27 1978-06-27 optical receiver circuit

Country Status (1)

Country Link
JP (1) JPS5850456B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01147576A (en) * 1987-12-04 1989-06-09 Canon Inc Elastic rotating body and fixing device

Also Published As

Publication number Publication date
JPS5850456B2 (en) 1983-11-10

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