A simple model to predict the holding voltage for SOI MOSFETs operating in the latch state

Abstract

A simple model is presented using one-dimensional bipolar theory to predict the holding voltage for silicon-on-insulator MOSFETs operating in the latch state. The holding voltage is a function of channel length as predicted by the model, and good agreement with experimental data is obtained for a recombination lifetime of 0.7 ns and k=0.015. The model also predicts that if the lifetime is reduced to 0.4 ns the holding voltage is only slightly increased for short-channel devices suggesting that decreasing the lifetime in the body by external means (e.g., gold doping) has little effect for small gate lengths. In addition the model can also predict the temperature dependence of the holding voltage.<>