MOS Transistor theory
MOS transistor is a majority-carrier device, in which the current in a conducting channel between the source and the drain is modulated when we applied a voltage to the gate.
There are basically two types of MOS(Metal oxide semiconductor): N-mos & P-mos
NMOS (n-type MOS transistor)
Majority carrier = electrons
PMOS (p-type MOS transistor)
Majority carrier = holes
Energy band diagram of MOS
There are three modes of operation of MOSFET
- In this case, applied voltage is less than flat band voltage or The voltage applied to the gate(on the metal side) is negative.
- In the depletion region, the voltage applied to the gate is greater than the flat band voltage and less than the threshold voltage.
- In the inversion region, the applied voltage is greater than the threshold voltage.
Why is MOS transistor used?
The MOSFET, short for Metal-Oxide-Semiconductor Field-Effect Transistor, is the most widely used type of transistor in modern electronics. Its main function is to regulate the flow of electricity between its source and drain terminals, depending on the voltage applied to its gate terminal.
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