JPS57106185A - Drive circuit for light emitting diode - Google Patents

Drive circuit for light emitting diode

Info

Publication number
JPS57106185A
JPS57106185A JP18354280A JP18354280A JPS57106185A JP S57106185 A JPS57106185 A JP S57106185A JP 18354280 A JP18354280 A JP 18354280A JP 18354280 A JP18354280 A JP 18354280A JP S57106185 A JPS57106185 A JP S57106185A
Authority
JP
Japan
Prior art keywords
bias
input terminal
light emitting
emitting diode
transistor
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
JP18354280A
Other languages
Japanese (ja)
Inventor
Sadamiki Kato
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
Nippon Electric Co 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP18354280A priority Critical patent/JPS57106185A/en
Publication of JPS57106185A publication Critical patent/JPS57106185A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
    • H03K5/01—Shaping pulses
    • H03K5/02—Shaping pulses by amplifying

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Led Devices (AREA)

Abstract

PURPOSE:To improve the distortion of a waveform, the characteristics of high frequency response and the quenching ratio by a light emitting diode drive means connecting the light emitting diode as the load of a transistor brought to a bias condition at all times and a bias current supply means feeding bias currents. CONSTITUTION:The light emitting diode 1 is connected as the load at the collector side of the transistor (TR)2, and an emitter is grounded. The emitter voltage of the TR2 is fed back to an input terminal of an operational amplifier 5 through a resistor 4. The operational amplifier 5 has a signal input terminal 6 and a bias voltage input terminal 7. Predetermined voltage is applied to the bias voltage input terminal, the bias currents 8 flow through the collector of the TR2, and the transistor is brought to an active condition at all times. Signal currents 9 corresponding to signal voltage applied to the signal input terminal 6 are added. The bias current supply circuit 10 is connected to the TR2. Accordingly, the distortion of the waveform, the characteristics of high frequency response and the quenching ratio are improved.
JP18354280A 1980-12-24 1980-12-24 Drive circuit for light emitting diode Pending JPS57106185A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18354280A JPS57106185A (en) 1980-12-24 1980-12-24 Drive circuit for light emitting diode

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18354280A JPS57106185A (en) 1980-12-24 1980-12-24 Drive circuit for light emitting diode

Publications (1)

Publication Number Publication Date
JPS57106185A true JPS57106185A (en) 1982-07-01

Family

ID=16137632

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18354280A Pending JPS57106185A (en) 1980-12-24 1980-12-24 Drive circuit for light emitting diode

Country Status (1)

Country Link
JP (1) JPS57106185A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01192574A (en) * 1988-01-28 1989-08-02 Oki Electric Ind Co Ltd Light emitting diode array driving circuit
JPH01192573A (en) * 1988-01-28 1989-08-02 Oki Electric Ind Co Ltd Light emitting diode array driving circuit
JPH0281652A (en) * 1988-09-19 1990-03-22 Oki Electric Ind Co Ltd Light emitting diode array driving circuit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01192574A (en) * 1988-01-28 1989-08-02 Oki Electric Ind Co Ltd Light emitting diode array driving circuit
JPH01192573A (en) * 1988-01-28 1989-08-02 Oki Electric Ind Co Ltd Light emitting diode array driving circuit
JPH0281652A (en) * 1988-09-19 1990-03-22 Oki Electric Ind Co Ltd Light emitting diode array driving circuit

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