Example 2.2 Consider the n-channel MOS process in Example 2.1. One may examine how a non-zero source-to-substrate voltage V_SB influences the threshold voltage of an nMOS transistor.

One can calculate the substrate-bias coefficient using the parameters provided in Example 2.1 as follows :

One is now in a position to determine the variation of threshold voltage V_T as a function of the source-to-substrate voltage V_SB . Assume the voltage V_SB to range from 0 to 5 V.