ADM: a new technique for the simulation of CMOS circuit transients

A relatively new method for solving general mathematical problems, Adomian´s Decomposition Method (ADM), has been modified for the solution of the systems of coupled, nonlinear, ordinary differential equations encountered in the transient analysis of CMOS circuits. Incorporated into a circuit simulator called FAST2 the method solves the systems directly, without linearization or discretization. The method is described and applied to a simple CMOS inverter. Further test runs on circuits with up to 456 transistors show that CPU time increases linearly as circuit complexity increases. Simulation results also show that FAST2 is significantly faster than the popular circuit analysis program SPICE for the same maximum error