AC Simulation Aspects of MOS Modeling

Daniel Foty
Gilgamesh Associates
Fletcher, Vermont


Most discussions of MOS modeling concentrate on DC current
descriptions.  However, in real circuits, modeling of the AC
components is of the greatest importance; this topic receives much less
attention than it deserves.  This presentation will review the models
for intrinsic MOSFET capacitances which are available in SPICE, noting
various shortcomings and methods to overcome them.