JPS6489632A - Optical receiving circuit - Google Patents

Optical receiving circuit

Info

Publication number
JPS6489632A
JPS6489632A JP62247162A JP24716287A JPS6489632A JP S6489632 A JPS6489632 A JP S6489632A JP 62247162 A JP62247162 A JP 62247162A JP 24716287 A JP24716287 A JP 24716287A JP S6489632 A JPS6489632 A JP S6489632A
Authority
JP
Japan
Prior art keywords
transistors
optical signal
incoming intensity
circuit
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.)
Pending
Application number
JP62247162A
Other languages
Japanese (ja)
Inventor
Takafumi Tamura
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 JP62247162A priority Critical patent/JPS6489632A/en
Publication of JPS6489632A publication Critical patent/JPS6489632A/en
Pending 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
    • H04B10/693—Arrangements for optimizing the preamplifier in the receiver
    • H04B10/6931—Automatic gain control of the preamplifier

Abstract

PURPOSE:To enlarge the dynamic range of an optical receiving circuit by lowering the input impedance of a pre-amplifier to amplify the output of a photo- detecting element when the incoming intensity of an optical signal is strong. CONSTITUTION:An output signal to correspond to the incoming intensity of the optical signal is inputted to an equalizing amplifying part 4. An AGC control voltage from an AGC circuit 5 has a characteristic to be increased with accompanying the increasing of the output voltage of the equalizing amplifying part 4 and the operating condition of transistors 8 and 9 is controlled. When the incoming intensity of the optical signal is weak, since a base potential is low, the transistors 8 and 9 go to a shutdown condition. Reversely, when the incoming intensity is strong, the transistors 8 and 9 go to an active condition and since a collector current is respectively flown, the input impedance of a pre- amplifying circuit 2 is lowered. As the result, since the saturation of the pre- amplifying circuit 2 is avoided, the dynamic range can be enlarged.
JP62247162A 1987-09-29 1987-09-29 Optical receiving circuit Pending JPS6489632A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62247162A JPS6489632A (en) 1987-09-29 1987-09-29 Optical receiving circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62247162A JPS6489632A (en) 1987-09-29 1987-09-29 Optical receiving circuit

Publications (1)

Publication Number Publication Date
JPS6489632A true JPS6489632A (en) 1989-04-04

Family

ID=17159360

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62247162A Pending JPS6489632A (en) 1987-09-29 1987-09-29 Optical receiving circuit

Country Status (1)

Country Link
JP (1) JPS6489632A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013004149A (en) * 2011-06-17 2013-01-07 Panasonic Corp Apc circuit, and optical disk playback device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5746544A (en) * 1980-09-04 1982-03-17 Fujitsu Ltd Optical agc circuit

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5746544A (en) * 1980-09-04 1982-03-17 Fujitsu Ltd Optical agc circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013004149A (en) * 2011-06-17 2013-01-07 Panasonic Corp Apc circuit, and optical disk playback device

Similar Documents

Publication Publication Date Title
MY116332A (en) Rf amplifier bias control method and apparatus
JPS5711548A (en) Optical receiving circuit
EP0382373A3 (en) Nonlinear noninverting transimpedance amplifier
JPS54104760A (en) Amplifier of low power consumption type
JPS6489632A (en) Optical receiving circuit
JPS52112261A (en) Power amplifier circuit
EP0354513A3 (en) Gain controlled amplifier circuit
JPS5546672A (en) Transistor amplifier circuit
JPS5580936A (en) Optical receiving circuit
JPS56119512A (en) Amplifier
JPS5452962A (en) Intermediate frequency amplifier
JPS56147533A (en) Light receiving and amplifying circuit
JPS6460011A (en) High frequency transistor amplifier
JPS55115708A (en) Push pull amplifier
JPS57199396A (en) Speaker input controlling circuit
JPS5447557A (en) Power amplifier
JPS57181215A (en) Variable gain circuit
JPS54147763A (en) Agc circuit for receiver
JPS53149715A (en) Correcting device for contour
JPS5652918A (en) Gain controlling circuit
JPS5442964A (en) Automatic gain control circuit
JPS56157108A (en) Gain controlling device
JPS5484956A (en) Automatic gain control circuit
JPS57147309A (en) Variable gain amplifier
JPS5748812A (en) Amplifier