Question

How Does a MOSFET act as An Amplifier?

Answer 1

1. A $MOSFET$ amplifier is one that makes use of Metal-Oxide-Semiconductor Field-Effect Transistor $\left(MOSFET\right)$ technology. One type of insulated-gate field-effect transistor is the $MOSFET$, often known as the $MOS$ (metal-oxide-silicon) transistor.
2. The $MOSFET$ functions as a switch, regulating the flow of current and voltage between the source and drain. The $MOS$ capacitor, which is the semiconductor surface below the oxide layers between the source and drain terminal, is what makes $MOSFETs$ function.
   
3. As with JFET (junction-gate field-effect transistor), a little change in gate voltage results in a significant change in drain current because of this, the $MOSFET$ will operate as an amplifier by amplifying a weak signal.
4. The command signal in this amplifier is a gate signal that regulates the flow of current between the Source $\left(S\right)$ and the Drain $\left(D\right)$.