AN-7506: Spicing-up Spice II software for power MOSFET modeling (Fairchild)

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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 doesn’t recognize these new developments. Its built-in FET models aren’t able to simulate all the modes of new power MOS device operation. For example, SPICE II doesn’t recognize the way a power MOSFET’s 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.

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