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Method and apparatus for time-differential comparison of an analog signal

  • US 8,324,941 B2
  • Filed: 03/01/2012
  • Issued: 12/04/2012
  • Est. Priority Date: 12/21/2007
  • Status: Expired due to Fees
First Claim
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1. A time-differential analog comparator, comprising:

  • a variable frequency signal source coupled to provide a repeating signal having a plurality of periods, wherein each period has a frequency corresponding to a value of an analog input;

    a counting circuit coupled to count the periods of the repeating signal, wherein the counting circuit is coupled to count in a first direction for a first time interval and coupled to count in a second direction opposite to the first direction for a second time interval that occurs after an end of the first time interval, wherein the counting circuit outputs a digital count signal; and

    an evaluation circuit coupled to the counting circuit to generate a decision signal in response to a count of the periods of the repeating signal indicated by the digital count signal after an end of the second time interval, wherein the first time interval is not equal to the second time interval to generate an offset in the decision signal.

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