In the “model internal circuit connections”, an instance name is followed by connection terminals and the model name. In the above example of a subcircuit model that combines an Nch MOSFET and a diode, the circuit connections, a device model of the MOSFET, and a device model of the diode are described. Subcircuit models are models of circuits, and such models include circuit connection information, device models, and other information. The basic configurations of device models and subcircuit models were explained in SPICE Model Types, but subcircuit models are somewhat complicated, and so are here briefly reviewed. In this article and the next, SPICE subcircuit models are explained, using MOSFETs as examples. In the previous article and in the article before that, examples of SPICE device models were explained.
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