JPS57129548A - Constant current load circuit - Google Patents

Constant current load circuit

Info

Publication number
JPS57129548A
JPS57129548A JP56015535A JP1553581A JPS57129548A JP S57129548 A JPS57129548 A JP S57129548A JP 56015535 A JP56015535 A JP 56015535A JP 1553581 A JP1553581 A JP 1553581A JP S57129548 A JPS57129548 A JP S57129548A
Authority
JP
Japan
Prior art keywords
current
constant current
load circuit
current load
converter
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
JP56015535A
Other languages
Japanese (ja)
Inventor
Toshiyuki Yamashita
Satoshi Ikeuchi
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 JP56015535A priority Critical patent/JPS57129548A/en
Publication of JPS57129548A publication Critical patent/JPS57129548A/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
    • H04B10/50—Transmitters

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Semiconductor Lasers (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Optical Communication System (AREA)

Abstract

PURPOSE:To reduce the electric power capacitance of a Zener diode as well as the heat dissipation, by securing a constant level of the load current regardless of a change of the threshold current of a laser diode for an optical intermediate repeater. CONSTITUTION:The voltage proportional to a bias current IB which is supplied from a DC/DC converter 14 is produced across a resistance 16. This voltage is inverted amplifier 17 and supplied to a DC/DC converter 18. Then a compensating current Ix flows to an earth from a power supply. As a result, the load current can be kept at a certain level regardless of a change of the threshold current of a laser diode 13.
JP56015535A 1981-02-04 1981-02-04 Constant current load circuit Pending JPS57129548A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56015535A JPS57129548A (en) 1981-02-04 1981-02-04 Constant current load circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56015535A JPS57129548A (en) 1981-02-04 1981-02-04 Constant current load circuit

Publications (1)

Publication Number Publication Date
JPS57129548A true JPS57129548A (en) 1982-08-11

Family

ID=11891495

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56015535A Pending JPS57129548A (en) 1981-02-04 1981-02-04 Constant current load circuit

Country Status (1)

Country Link
JP (1) JPS57129548A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05268167A (en) * 1992-03-19 1993-10-15 Mitsubishi Electric Corp Optical repeater

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05268167A (en) * 1992-03-19 1993-10-15 Mitsubishi Electric Corp Optical repeater

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