TAS: an accurate timing analyser for CMOS VLSI

  • Authors:
  • A. Hajjar;A. Greiner;R. Marbot;P. Kiani

  • Affiliations:
  • BULL SA, rue Jean Jaures, Les Clayes-sous-Bois;Univ. Pierre & Marie Curie, Paris;BULL SA, rue Jean Jaures, Les Clayes-sous-Bois;Univ. Pierre & Marie Curie, Paris

  • Venue:
  • EURO-DAC '91 Proceedings of the conference on European design automation
  • Year:
  • 1991

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Abstract

A CMOS timing analyser using accurate delay models is presented. Switch-level analytic delays are derived from (I/V) characteristics of short-channel Mosfets. A significant improvement in accuracy is obtained from the analysis of pertinent capacitances, modeling conflicts and slope effects in CMOS gates. The program handles large-scale circuits and gives the worst-case delays between circuit terminals in realistic CPU times. The algorithm of path-analysis is described. It is concluded that the run time is linear with the number of transistors, the accuracy within 5% over a wide range of design types.