Modular circuit simulation with integrated applications

A modular approach to circuit simulation is proposed in which the traditional ''closed'' structure of circuit simulators is replaced by a collection of loosely coupled ''simulation primitives'' which can be combined in different ways, depending upon a particular application. An implementation of this approach, the SPICE-PAC simulation package, is described. SPICE-PAC is compatible with the popular SPICE circuit simulator, but it also supports a number of extensions and refinements which are not available in the original SPICE-like programs. Several integrated applications are discussed in greater detail to illustrate the flexibility of the proposed approach.