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LED driving circuit and optical transmitting module

  • US 6,724,376 B2
  • Filed: 05/16/2001
  • Issued: 04/20/2004
  • Est. Priority Date: 05/16/2000
  • Status: Expired due to Term
First Claim
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1. An LED driving circuit comprising:

  • a pulse generation circuit for shaping a waveform of an externally input signal and generating first and second pulses having a complementary relationship;

    a first voltage transfer circuit for applying to an LED a first output voltage of a low level on the basis of the first pulse, and a second voltage transfer circuit for applying to the LED a second output voltage of a high level on the basis of the second pulse, wherein the high level is substantially equal to a froward voltage for generating a forward peak current of the LED necessary for outputting light of a predetermined intensity from the LED, the low level is substantially equal to a voltage for changing an emission intensity of the LED to zero or a negligible value, and a real part of an output impedance of said pulse generation circuit is smaller than an internal series resistance of the LED.

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