Explain the three regions of operation of a MOSFET.

Cut-off region: When VGS < Vt, no channel is induced and the MOSFET will be in cut-off region. No current flows.
Triode region: When VGS ≥ Vt, a channel will be induced and current starts flowing if VDS > 0. MOSFET will be in triode region as long as VDS < VGS – Vt.
Saturation region: When VGS ≥ Vt, and VDS ≥ VGS – Vt, the channel will be in saturation mode, where the current value saturates. There will be little or no effect on MOSFET when VDS is further increased.

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