Non-quasi Static (NQS) Model

An non-quasi-static (NQS) model is desirable in some mixed signal IC and radio frequency (RF) applications.

For long channel devices the channel transit time is roughly inversely proportional to (Vgs -Vth) and proportional to L2 .

没有NQS模型的时候，通常电路设计者会在高频中将一个长沟道MOSFET分割成N个等块，但是在沟道长度变小的时候，这个方法也不适用了。

In BSIM3, an NQS model based on the Elmore equivalent RC circuit is used. It employs a physical relaxation time approach to account for the finite channel charging time. This NQS model is applicable for both large signal transient and small signal AC analysis, as is discussed next.

Bsim3 学习笔记9