JPS6257447U - - Google Patents

Info

Publication number
JPS6257447U
JPS6257447U JP1985148442U JP14844285U JPS6257447U JP S6257447 U JPS6257447 U JP S6257447U JP 1985148442 U JP1985148442 U JP 1985148442U JP 14844285 U JP14844285 U JP 14844285U JP S6257447 U JPS6257447 U JP S6257447U
Authority
JP
Japan
Prior art keywords
photodiode
parallel
circuit
terminal
parallel circuit
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
JP1985148442U
Other languages
Japanese (ja)
Other versions
JPH04598Y2 (en
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 filed Critical
Priority to JP1985148442U priority Critical patent/JPH04598Y2/ja
Publication of JPS6257447U publication Critical patent/JPS6257447U/ja
Application granted granted Critical
Publication of JPH04598Y2 publication Critical patent/JPH04598Y2/ja
Expired legal-status Critical Current

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  • Monitoring And Testing Of Transmission In General (AREA)
  • Optical Communication System (AREA)

Description

【図面の簡単な説明】[Brief explanation of the drawing]

第１図はこの考案の光信号入力検知回路の一実
施例を示す電気回路図、第２図は光信号入力検知
回路の従来例を示す電気回路図、第３図は遅延応
答時間を説明する図、第４図は信号光強度変化に
対応して遅延応答時間が変化することを説明する
図。 １…フオトダイオード、２…抵抗、４…ローパ
スフイルタ、５…比較器、６…電流―電圧変換増
幅回路、７…ダイオード。 Fig. 1 is an electric circuit diagram showing an embodiment of the optical signal input detection circuit of this invention, Fig. 2 is an electric circuit diagram showing a conventional example of the optical signal input detection circuit, and Fig. 3 explains delay response time. FIG. 4 is a diagram illustrating how the delay response time changes in response to changes in signal light intensity. 1... Photodiode, 2... Resistor, 4... Low pass filter, 5... Comparator, 6... Current-voltage conversion amplifier circuit, 7... Diode.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] フオトダイオードと電流―電圧変換増幅器を具
備する光受信器において、フオトダイオードの一
方の端子と電源との間に、ダイオード、ツエナー
ダイオードの一方と抵抗とからなる並列回路を接
続し、フオトダイオードと並列回路との接続点を
、ローパスフイルタを介在させて、所定の基準電
位を有する比較器の入力端子に接続したことを特
徴とする光信号入力検知回路。 In an optical receiver equipped with a photodiode and a current-to-voltage conversion amplifier, a parallel circuit consisting of a diode, one of the Zener diodes, and a resistor is connected between one terminal of the photodiode and a power supply, and the parallel circuit is connected in parallel with the photodiode. An optical signal input detection circuit characterized in that a connection point with the circuit is connected to an input terminal of a comparator having a predetermined reference potential with a low-pass filter interposed.
JP1985148442U 1985-09-27 1985-09-27 Expired JPH04598Y2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1985148442U JPH04598Y2 (en) 1985-09-27 1985-09-27

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1985148442U JPH04598Y2 (en) 1985-09-27 1985-09-27

Publications (2)

Publication Number Publication Date
JPS6257447U true JPS6257447U (en) 1987-04-09
JPH04598Y2 JPH04598Y2 (en) 1992-01-09

Family

ID=31062714

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1985148442U Expired JPH04598Y2 (en) 1985-09-27 1985-09-27

Country Status (1)

Country Link
JP (1) JPH04598Y2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01215140A (en) * 1988-02-23 1989-08-29 Fujitsu Ltd Optical receiver
JP2007116576A (en) * 2005-10-24 2007-05-10 Taiko Denki Co Ltd Light receiving device for spatial optical communication

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5330447A (en) * 1976-09-02 1978-03-22 Matsushita Electric Ind Co Ltd Method of stabilizing electric power supply points in contact tips of arc welding machine
JPS58168343A (en) * 1982-03-29 1983-10-04 Fujitsu Ltd Optical agc circuit
JPS59148441A (en) * 1983-02-15 1984-08-25 Nec Corp System for detecting optical input level
JPS6079840A (en) * 1983-10-06 1985-05-07 Fujitsu Ltd Optical reception circuit

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5330447A (en) * 1976-09-02 1978-03-22 Matsushita Electric Ind Co Ltd Method of stabilizing electric power supply points in contact tips of arc welding machine
JPS58168343A (en) * 1982-03-29 1983-10-04 Fujitsu Ltd Optical agc circuit
JPS59148441A (en) * 1983-02-15 1984-08-25 Nec Corp System for detecting optical input level
JPS6079840A (en) * 1983-10-06 1985-05-07 Fujitsu Ltd Optical reception circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01215140A (en) * 1988-02-23 1989-08-29 Fujitsu Ltd Optical receiver
JP2007116576A (en) * 2005-10-24 2007-05-10 Taiko Denki Co Ltd Light receiving device for spatial optical communication

Also Published As

Publication number Publication date
JPH04598Y2 (en) 1992-01-09

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