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A calibrated model for the subthreshold operation of a short channel MOSFET including surface states

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2 Author(s)

Describes a simple two-dimensional subthreshold model for short channel MOSFET's. The effects of surface state density are also included in the model. A regional charge density approximation was used in the solution of Poisson's equation and an analytical solution of the continuity equation in two dimensions was derived. Excessive computations are avoided in the present model; this was made possible by the use of a valid regional charge approximation. The model was experimentally verified by performing measurements on short channel devices. The model was calibrated from measurements on a long channel device which was present on the same silicon chip. Results are presented for the subthreshold leakage current as a function of substrate bias, polysilicon gate length, diffusion depth and surface state density.

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:14 ,  Issue: 3 )

Date of Publication:

June 1979

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