A novel probabilistic approach for IC diagnosis based on differential quiescent current signatures

  • Authors:
  • C. Thibeault

  • Affiliations:
  • -

  • Venue:
  • VTS '97 Proceedings of the 15th IEEE VLSI Test Symposium
  • Year:
  • 1997

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Abstract

In this paper, we propose a novel IC diagnosis approach, based on probabilistic differential quiescent current (I/sub DDQ/) signatures. Unlike the previous diagnosis approaches using current, this approach, using the maximum likelihood estimation, provides a solid framework allowing to quantify its robustness with respect to current measurement variations. The differential nature of the signatures allows to treat subthreshold leakage currents as a noise source. Results are provided showing the robustness of the approach. The applicability of the approach on embedded logic is also briefly discussed.