The drain current enhancement due to the velocity overshoot effects is found to be due to the electron velocity enhancement at the source end. Based on this observation, a new analytic model is proposed and verified by two-dimensional (2-D) simulations and experiments. From the results of the verifications, we conclude that our model predicts the drain current enhancement due to the velocity overshoot effects reasonably well. The effects of the device parameters, such as gate oxide thickness and channel doping concentration, on the drain current enhancement ran be readily found in our model.
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Song et al. (1996) studied this question.
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