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Symbolic Verification of MOS Circuits
The program MOSSYM simulates the behavior of a MOS circuit represented as a switch-level network symbolically. That is, during simulator operation the user can set an input to either 0, 1, or a Boolean variable. The simulator then computes the behavior of the circuit as a function of the past and present input variables. By using heuristically efficient Boolean function manipulation algorithms, the verification of a circuit by symbolic simulation can proceed much more quickly than by exhaustive logic simulation. In this paper we present our concept of symbolic simulation, derive an algorithm for switch-level symbolic simulation, and present experimental measurements from MOSSYM.