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INTERFACE CIRCUIT

  • US 20080265940A1
  • Filed: 04/23/2008
  • Published: 10/30/2008
  • Est. Priority Date: 04/26/2007
  • Status: Active Grant
First Claim
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1. An interface circuit comprising:

  • a receiving circuit operating on a supply voltage lower than a high-level voltage value of an input binary signal;

    an input level determination circuit generating an input level determination signal having a frequency higher than a frequency of the binary signal and controls whether to output the input level determination signal or not, based on a voltage level of the binary signal; and

    an AC coupling element connected between an output terminal of the input level determination circuit and an input terminal of the receiving circuit.

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