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Light-receiving circuit

  • US 20060027736A1
  • Filed: 08/08/2005
  • Published: 02/09/2006
  • Est. Priority Date: 08/09/2004
  • Status: Active Grant
First Claim
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1. A light-receiving circuit for receiving an input optical signal, comprising:

  • a voltage source for providing a voltage output;

    a first current mirror circuit having an input terminal for receiving said voltage output from said voltage source, a current setting terminal for providing a bias voltage, and a current mirroring terminal;

    an avalanche photodiode for receiving said input optical signal, said avalanche photodiode being connected to said current mirroring terminal of said first current mirror circuit to receive said bias voltage; and

    a current source connected to said current setting terminal of said first current mirror circuit, said current source generating a reference current, wherein said bias voltage varies so as to have said reference current set by said current source flowing in said avalanche photodiode.

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