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System for digitizing and displaying analog signatures of integrated circuits

  • US 4,965,516 A
  • Filed: 05/27/1988
  • Issued: 10/23/1990
  • Est. Priority Date: 05/27/1988
  • Status: Expired due to Term
First Claim
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1. An apparatus for developing, digitizing, and displaying analog signature information, comprising:

  • means for developing an analog signature signal representative of the operating condition of a selected element of an electronic circuit;

    means for converting said analog signature signal to test digital values and storing said test digital values;

    means for developing and storing reference digital values for the same element as said selected element, wherein said same element is known to be operating properly;

    means responsive to said stored digital values and said reference digital values, respectively, to produce reconstructed analog signatures therefrom which are substantially identical to analog signatures obtained directly from said selected element and said same element; and

    means for simultaneously displaying said reconstructed signatures.

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