A simple method to obtain an analytical current model for nonrectangular-gate layout in SOI MOSFETs is presented, based on partition of the original layout into trapezoidal parts, and modeling these trapezoids by a closed form expression. A generic shape factor is defined for comparison between devices of different shapes in the same technology. Three-dimensional simulation and some experimental results were carried out to verify the method accurateness. The obtained expression showed good agreement both to simulation and experimental results. The method can be applied to a wide range of gate layout shapes.
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