An Histogram Based Procedure for Current Testing of Active Defects

  • Authors:
  • C. Thibeault

  • Affiliations:
  • -

  • Venue:
  • ITC '99 Proceedings of the 1999 IEEE International Test Conference
  • Year:
  • 1999

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Abstract

The purpose of this paper is to propose a newhistogram-based differential current testing procedure ofactive defects. This procedure contains three steps: Pre-analysis,Failure Analysis, and Production Testing. Themain objectives of the Pre-analysis are to provideinformation on the most frequent active current defectsand to help setting the limits between faulty and fault-freedevices; these limits are then investigated during theFailure Analysis step in order to set the threshold betweenfaulty and fault-free ICs. During the Production Testingstep, this threshold is compared to the highest peak valueappearing in a histogram built for each tested IC. Someselected results are presented, which confirm the testquality gain increase by using differential IDDQ instead ofIDDQ itself as well as the additional reduction of bad testdecision that can be obtained by a wise selection of testvectors reducing the vector-to-vector current variations.