Quick notes on MOSFET modes of operation.
I’ve used FETs for a few projects. For switches they are fairly simple
rudimentary components that are fairly easy to build into a circuit.
Basic Modes of Operation
For Enhancement Mode FETs
Cutoff: Vgs > Vth
Linear: Vgs > Vth and Vds < (Vgs - Vth)
Saturation: Vgs > Vth and Vds > (Vgs - Vth)