Accuracy of approximations in MOSFET charge models |
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Authors: | McAndrew C.C. Victory J.J. |
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Affiliation: | Motorola Inc., Tempe, AZ; |
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Abstract: | This paper analyzes the results of common approximations made in MOSFET charge modeling. The basis for the comparison is a charge-sheet model that is valid in all regions of operation. We show that proper modeling of surface potential as a function of position along the channel is more important for capacitance coefficient modeling accuracy than partitioning of inversion charge between source and drain. In addition, we show that there is a numerical error in previous charge-sheet formulations, and provide a solution for this problem |
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