A charge-conserving silicon-on-sapphire SPICE MOSFET model for analogue design

A CAD model for silicon-on-sapphire (SOS) MOSFETs that is suitable for analogue circuit design is presented. The model accounts for drift and diffusion components of channel current and is therefore continuous from subthreshold to strong inversion. The channel current components are specified in terms of the surface potential drain and source, which is calculated without the need for an iterative solution. The kink effect is included in both the drift and diffusion components and predicts the observed increase in subthreshold slope with drain voltage. An equivalent circuit is presented which includes substrate resistance. Implementation of the nine-node model in SPICE2 has been achieved and sample simulation results are presented and compared with device and circuit measurements.<
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