Subthreshold analysis of an MOS analog switch

Abstract
Charge injection error in the presence of sub- threshold effects has been analyzed. It is confirmed that the subthreshold effect is significant at low voltage falling rates. A simplified model is derived using an appropriate approximation. Predictions are compared to the results of a SPICE simulation, a nonquasi-static (NQS) model simulation and experimental results. Excellent agreement between the modified and NQS model and recently published experimental results was obtained. This ana- lytical model is computationally efficient compared to the SPICE and NQS models and provides physical insight into the switching errors.

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