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The SPICE II simulation software package is familiar to most designers working in computer-aided design of integrated
circuits. Developed by L. W. Nagel in 1973, SPICE II has become a widely available, well-understood design tool for lC modeling and analysis. But, SPICE II has a shortcoming: its standard simulation programs were developed when all MOSFETs were low-power devices. Power MOS devices are growing in use today, both as discrete components and, potentially, as output stages of power integrated circuits. SPICE II in its current form doesnt recognize these new
developments. Its built-in FET models arent able to simulate all the modes of new power MOS device operation. For
example, SPICE II doesnt recognize the way a power MOSFETs internal capacitances change with bias conditions, the presence of a cascode JFET that compli-cates both static and dynamic operation, or the presence of a parasitic body diode that affects operation in the third quadrant. Without this information, SPICE II will predict power MOSFET performance that is incorrect.