A continuous, analytic drain-current model for DG MOSFETs

This letter presents a continuous analytic current-voltage (I-V) model for double-gate (DG) MOSFETs. It is derived from closed-form solutions of Poisson\´s equation, and current continuity equation without the charge-sheet approximation. The entire I_ds(V_g,V_ds) characteristics for all regions of MOSFET operation: linear, saturation, and subthreshold, are covered under one continuous function, making it ideally suited for compact modeling. By preserving the proper physics, this model readily depicts "volume inversion" in symmetric DG MOSFETs-a distinctively noncharge-sheet phenomenon that cannot be reproduced by standard charge-sheet based I-V models. It is shown that the I-V curves generated by the analytic model are in complete agreement with two-dimensional numerical simulation results for all ranges of gate and drain voltages.