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Ecap II, a nonlinear dc and transient circuit analysis program, uses a free-format, problem-oriented language for describing circuit parameters and topology. Its computation speed is high enough to make the transient analysis of kilobranch nonlinear circuits feasible. The program includes a nested model feature that permits the user to store circuit descriptions of devices and subcircuits for subsequent recall and insertion into larger circuits. Nonlinearities can be specified by means of tables, built-in functions such as the diode equation, and Fortran subroutines. A diagnostic feature pinpoints errors in the input format or inconsistencies in the circuit description.
Branin et al. (Tue,) studied this question.