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A new random telegraph signal (RTS) amplitude model based upon band bending fluctuations has been developed, in contrast to other studies of RTS noise amplitudes, which are derived from RTS fitting parameters, it is demonstrated in this work that noise amplitudes may be predicted from band bending calculations and device DC characteristics. This new model suggests that the decrease in band bending associated with slow-state trapping results in mobility degradation for low gate biases (Coulombic-scattering-limited) and an enhancement in mobility due to vertical field reductions at high gate biases (surface roughness/phonon scattering limited). The band bending formulation shows good correlation with experimental data and accurately predicts the observed dependence upon effective channel length and width.
Date of Publication: Sept. 1997