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Symbolic analysis of large analog circuits with determinant decision diagrams

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2 Author(s)
Shi, C.-J.R. ; Dept. of Electr. & Comput. Eng., Iowa Univ., Iowa City, IA, USA ; Xiangdong Tan

Symbolic analog-circuit analysis has many applications, and is especially useful for analog synthesis and testability analysis. We present a new approach to exact and canonical symbolic analysis by exploiting the sparsity and sharing of product terms. It consists of representing the symbolic determinant of a circuit matrix by a graph-called determinant decision diagram (DDD)-and performing symbolic analysis by graph manipulations. We showed that DDD construction and DDD-based symbolic analysis can be performed in time complexity proportional to the number of DDD vertices. We described a vertex ordering heuristic, and showed that the number of DDD vertices can be quite small-usually orders-of-magnitude less than the number of product terms. The algorithm has been implemented. An order-of-magnitude improvement in both CPU time and memory usage over existing symbolic analyzers ISAAC and Maple-V has been observed for large analog circuits.

Published in:

Computer-Aided Design, 1997. Digest of Technical Papers., 1997 IEEE/ACM International Conference on

Date of Conference:

9-13 Nov. 1997

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