Abstract
An enhanced BSIM3 non-quasi-static (NQS) model for the large signal transient has been developed. The enhancement followed the same device topology adopted in the BSIM3 NQS model with the addition of a unified equation for the transient gate and substrate current in both the accumulation and inversion operation region. During strong inversion, the existing relaxation time approach is used to model the NQS effect, while in the accumulation region, the MOS transistor behavior is like a MOS capacitor without the source and drain region. The dynamic conversion among the accumulation, depletion and inversion charges is modeled to give the transient substrate and gate current. The enhancement has been implemented in the newly released BSIM3 version 3.2, and comparison has been made with results obtained from a 2-D device simulator. The time penalty for using the new enhancement is about 18% more than the original model.
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