MOSFET as a Switch

When the MOSFET is used as a switch, it is operated at the extrme points of the transfer curve. Specifically, the device is turned ON in the triode region, OFF in the cutoff region, transit through the saturation region.

 

 

 

INPUT: HIGH

VGS > Vt & VDS < VGS-Vt

TURN ON THE SWITCH

@ TRIODE REGION

 

INPUT: LOW

VGS < Vt

TURN OFF THE SWITCH

@ CUT-OFF REGION