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JPS55148475A - Automatic gain control system - Google Patents

Automatic gain control system

Info

Publication number
JPS55148475A
JPS55148475A JP5563679A JP5563679A JPS55148475A JP S55148475 A JPS55148475 A JP S55148475A JP 5563679 A JP5563679 A JP 5563679A JP 5563679 A JP5563679 A JP 5563679A JP S55148475 A JPS55148475 A JP S55148475A
Authority
JP
Japan
Prior art keywords
output
photodiode
direct current
amplifier
standard
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
JP5563679A
Other languages
Japanese (ja)
Inventor
Haruo Fujiwara
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 JP5563679A priority Critical patent/JPS55148475A/en
Publication of JPS55148475A publication Critical patent/JPS55148475A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/02—Details
    • H01L31/02016—Circuit arrangements of general character for the devices
    • H01L31/02019—Circuit arrangements of general character for the devices for devices characterised by at least one potential jump barrier or surface barrier
    • H01L31/02027—Circuit arrangements of general character for the devices for devices characterised by at least one potential jump barrier or surface barrier for devices working in avalanche mode

Landscapes

  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Light Receiving Elements (AREA)

Abstract

PURPOSE:To widen the dynamic range of an automatic gain control system by employing an avalanche photodiode (APD) for receiving a light input signal and the output of the APD for receiving the direct current light of a standard light source. CONSTITUTION:A light input signal is applied to an avalanche photodiode 11, and the output of the diode 11 is amplified by an amplifier 12 and then superimposed with the DC bias voltage of an avalanche photodiode 13. A direct current standard light is irradiated from a standard light surface 15 to the photodiode 13. The output of the amplifier 14 is detected in peak value by a peak value detector 16, the output of the detector 16 is compared with the standard voltage by a differential amplifier 17, which produces an error voltage for controlling the drive current of the standard light source 15 through a transistor 18 and the direct current bias voltage of the photodiode 13 through a DC/DC converter 19. The direct current bias voltage of the photodiode 17 is simultaneously controlled by the error voltage of the output of the amplifier 17.
JP5563679A 1979-05-09 1979-05-09 Automatic gain control system Pending JPS55148475A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5563679A JPS55148475A (en) 1979-05-09 1979-05-09 Automatic gain control system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5563679A JPS55148475A (en) 1979-05-09 1979-05-09 Automatic gain control system

Publications (1)

Publication Number Publication Date
JPS55148475A true JPS55148475A (en) 1980-11-19

Family

ID=13004280

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5563679A Pending JPS55148475A (en) 1979-05-09 1979-05-09 Automatic gain control system

Country Status (1)

Country Link
JP (1) JPS55148475A (en)

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