On behavioral modeling of analog and mixed-signal circuits

Behavioral simulation of complex, inherently highly nonlinear mixed-signal systems is often the only effective way to evaluate possible system performance before fabrication and characterization of the hardware system. Transistor-level, SPICE, simulations of these systems are often practically impossible because of the enormous computational time required due to the many interactions of all the nonlinearities and the widely separated system time constants. New behavioral models for useful electronic functions have been developed as straightforward mathematical descriptions that can be evaluated by general purpose mathematical programs and system simulators. The models are targeted for MATLAB and use standard MATLAB expressions and linked C and FORTRAN codes. An example PLL behavioral model is presented and evaluated by comparing simulated performance to actual experimental integrated circuit performance