Vt Model Formulation: SCE (Vt Roll-Off) Due to Charge Sharing
Starting from long-channel, nonuniform-doping Vt equation, based on charge-sharing model, short-channel Vt has an equivalent form if g is replaced by geff. The added fitting parameter d is used to model DIBL, with a linear Vbs dependence
Fitting parameters: l, d0 and d1