gate resistance calculation
Hello,
As previously mentioned, you need to know the layout used when creating the gate process. I'm not sure why there's an n squared in the denominator; I was only expecting n. You hab=ve the factor of 3 in the denominator to account for the distributed nature of the gate transmission properties if it's a single ended connection, however a factor of 12 is required if it is doubly connected. If you look at some of the BSIM3 manuals, the Zin is discussed at great length and some finer corrections are included to improve the accuracy.
Regards,
MoonShine