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Symbolic analysis of large analog integrated circuits by approximation during expression generation

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5 Author(s)
F. V. Fernandez ; Dept. Elektrotechniek, Katholieke Univ., Belgium ; P. Wambacq ; G. Gielen ; A. Rodriguez-Vazquez
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A novel algorithm is presented that generates approximate symbolic expressions for small-signal characteristics of large analog integrated circuits. The method is based upon the approximation of an expression while it is being computed. The CPU time and memory requirements are reduced drastically with regard to previous approaches, as only those terms are calculated which will remain in the final expression. As a consequence, the maximum circuit size amenable to symbolic analysis has largely increased. The simplification procedure explicitly takes into account variation ranges of the symbolic parameters to avoid inaccuracies of conventional approaches which use a single value. The new approach is also able to take into account mismatches between the symbolic parameters

Published in:

Proceedings of IEEE International Symposium on Circuits and Systems - ISCAS '94  (Volume:1 )

Date of Conference:

30 May-2 Jun 1994