Estimation of maximum current envelope for power bus analysis and design

  • Authors:
  • S. Bobba;I. N. Hajj

  • Affiliations:
  • Coordinated Science Lab & ECE Dept., University of Illinois at Urbana-Champaign, Urbana, Illinois;Coordinated Science Lab & ECE Dept., University of Illinois at Urbana-Champaign, Urbana, Illinois

  • Venue:
  • ISPD '98 Proceedings of the 1998 international symposium on Physical design
  • Year:
  • 1998

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Abstract

In this p ap er we pr esent an inputpattern independent method to compute the maximum current envelope, which is an upper bound over all possible curr ent waveforms drawn by a circuit. The maximum current envelope can be used to compute the worst-c ase RMS current and average cur rent dr awn by a set of gates. These current values can be used in the design of the p ower bus to ensure that the power bus interconne cts are not susc eptible to ele ctromigration (EM) induced failur e. We also present comparisons with exhaustive/long simulations for MCNC/ISCAS-85 benchmark circuits to verify the accuracy of the method.