Hello,i am trying to learn the gm over id of a mosfet from a manual shown bellow.
From where did the formula bellow came?
is there some theoretical background i could use?
Thanks.
https://people.eecs.berkeley.edu/~boser/presentations/2011-12 OTA gm Id.pdf

 

\( 2\pi f_{t} C_{gs}\;=\; \cfrac{1}{X_C}\;=\; g_{m} \)

Does that clear things up?

Interesting presentation BTW.