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A new symbolic simulator, called ISAAC (Interactive Symbolic Analysis of Analog Circuits) is described. ISAAC is able to derive all AC characteristics of both time-continuous and time-discrete analog circuits. Any linear network function is calculated by means of the consecutive set-up and resolution of a set of s-or z-domain compacted MNA (CMNA) equations. Symbolic term cancellations are treated in an efficient way. ISAAC can generate both exact and compact approximated results. The approximation is performed by means of a heuristic algorithm. For complex cells such as a Miller compensated opamp and a fifth order SC ladd er fUter, CPU times on a one MIPS machine are below 30 seconds.

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