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Method and apparatus for accurately determining the crossing point within a logic transition of a differential signal

  • US 6,785,621 B2
  • Filed: 09/27/2001
  • Issued: 08/31/2004
  • Est. Priority Date: 09/27/2001
  • Status: Expired due to Term
First Claim
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1. A method, comprising:

  • a) forming a product waveform by multiplying a positive signal waveform and negative signal waveform, said positive signal waveform and said negative signal waveform being representative of a logical transition within a differential signal; and

    b) determining the crossing point voltage of said logical transition within said differential signal by calculating the square root of a maximum of said product waveform.

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