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JPS6441531A - Optical detection circuit - Google Patents

Optical detection circuit

Info

Publication number
JPS6441531A
JPS6441531A JP62197683A JP19768387A JPS6441531A JP S6441531 A JPS6441531 A JP S6441531A JP 62197683 A JP62197683 A JP 62197683A JP 19768387 A JP19768387 A JP 19768387A JP S6441531 A JPS6441531 A JP S6441531A
Authority
JP
Japan
Prior art keywords
potential
connecting point
external noise
resistor
noise light
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
JP62197683A
Other languages
Japanese (ja)
Other versions
JPH0783311B2 (en
Inventor
Kouichi Shiratama
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
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 filed Critical NEC Corp
Priority to JP62197683A priority Critical patent/JPH0783311B2/en
Publication of JPS6441531A publication Critical patent/JPS6441531A/en
Publication of JPH0783311B2 publication Critical patent/JPH0783311B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)
  • Light Receiving Elements (AREA)

Abstract

PURPOSE:To eliminate a DC current generated by an external noise light by providing a series circuit comprising a diode and a resistor in parallel with a resistor connected in series with a photodetector. CONSTITUTION:When the level of incoming external noise light is low and the DC current generated in a photodetector 1 is small, the potential at a connecting point 10 is low and the diode 4 is nonconductive. When the incoming external noise light level is high and the DC current generated in the detector 1 is high, the potential at the connecting point 10 rises, the diode 4 is conductive and the rate of rise in the potential at the connecting point 10 with respect to the input light level is reduced. In this case, if the resistor 3 is selected sufficiently smaller than the resistor 2, the effect comes eminently. Even when the external noise light with a large level is given in this way, when the potential at the connecting point 10 does not reach +V(volt), the AC signal component passes through a capacitor 5 and outputted via an amplifier 6.
JP62197683A 1987-08-07 1987-08-07 Photo detection circuit Expired - Lifetime JPH0783311B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62197683A JPH0783311B2 (en) 1987-08-07 1987-08-07 Photo detection circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62197683A JPH0783311B2 (en) 1987-08-07 1987-08-07 Photo detection circuit

Publications (2)

Publication Number Publication Date
JPS6441531A true JPS6441531A (en) 1989-02-13
JPH0783311B2 JPH0783311B2 (en) 1995-09-06

Family

ID=16378608

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62197683A Expired - Lifetime JPH0783311B2 (en) 1987-08-07 1987-08-07 Photo detection circuit

Country Status (1)

Country Link
JP (1) JPH0783311B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0660547A1 (en) * 1993-12-22 1995-06-28 BRÄHLER ICS Konferenztechnik International Congress Service Infrared radiation receiver and information transmission method
WO2011061965A1 (en) * 2009-11-18 2011-05-26 太陽誘電株式会社 Visible light receiver circuit

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5854744A (en) * 1981-09-28 1983-03-31 Hitachi Ltd Ray receiving circuit

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5854744A (en) * 1981-09-28 1983-03-31 Hitachi Ltd Ray receiving circuit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0660547A1 (en) * 1993-12-22 1995-06-28 BRÄHLER ICS Konferenztechnik International Congress Service Infrared radiation receiver and information transmission method
WO2011061965A1 (en) * 2009-11-18 2011-05-26 太陽誘電株式会社 Visible light receiver circuit
JPWO2011061965A1 (en) * 2009-11-18 2013-04-04 太陽誘電株式会社 Visible light receiving circuit
US8742317B2 (en) 2009-11-18 2014-06-03 Taiyo Yuden Co., Ltd. Visible light receiver circuit

Also Published As

Publication number Publication date
JPH0783311B2 (en) 1995-09-06

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