MOSFET (MOS transistor) Definition/Meaning:
Acronym far metal oxide semiconductor field-effect
transistor. A type of field-effect transistor that has an insulating layer of
oxide, usually silicon dioxide, separating the gate from the drain-source
conduction channel in the semiconductor. In an NMQS the channel is formed
between n-type source and drain by negative charge carriers (i.e. electrons). In
a PMOS the channel is formed between p-type source and drain by positive charge
carriers (i.e. holes). The circuit symbols are shown in the diagram.
MOSFETs require no gate input current, other than a pulse to charge or discharge
their input capacitance. They can operate at higher switching speeds and lower
currents than bipolar transistors.