A Physical MOSFET Model Applicable to Extremely Scaled CMOS IC Design

A process-based model (UFET) for deep-submicron bulk-silicon MOSFETs is developed and verified with numerical device simulations and measured data. The charge-based model is physical with accountings for the predominant short-channel (e.g., charge sharing, drain-induced threshold reduction and velocity saturation) and extremely scaled-technology (i.e., energy quantization and polysilicon-gate depletion) effects in MOSFETs. The key to UFET is the characterization of the bias-dependent two-dimensional regions near the source/ drain junctions which can extend over a significant fraction of the metallurgical channel length. When these two-dimensional regions near the junctions are modeled, the physical charge-sheet model can be applied to the remaining "quasi-two- dimensional" channel length to define the channel current and terminal charges, without resorting to empiricism to account for the short-channel effects. Special attention paid to continuity in the derivation of the model formalism yields a physical C-infinity model applicable to analog and digital CMOS circuit design. The small number of physical, process-based parameters simplifies the model calibration, and renders the model suitable for predictive device/circuit simulation, statistical simulations and circuit sensitivity analyses based on known or presumed process variations.

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