Metal-Oxide Field Effect Transistor
A Transistor that is controlled with Voltage.
note: Assume these notes are written for n-type transistors unless specified otherwise. The voltage polarity for p-type is opposite to that of n-type.
Structure
Characteristics
Modes of Operation
Cutoff
Triode
Deep Triode
Saturation
Second-Order Effects
A voltage applied to the body of a MOSFET alters the charge of the channel region, effectively changing the Threshold Voltage.
As the drain-source voltage increases, a depletion region forms around the drain. In the channel region, this reduces the effective channel-length and reduces the control of the gate.