What is MOSFET?
MOSFET, also called MOS or MOS field effect transistor, is Metal-Oxide-Semiconductor Field-Effect-Transistor, which belongs to the insulated gate type. Its main feature is that there is a layer of silicon dioxide insulation between the metal gate and the channel, so it has a very high input resistance.
MOSFET is divided into N-channel tube and P-channel tube. Usually the substrate (substrate) is connected to the source S.
According to the different conduction methods, MOSFET is divided into enhancement type and depletion type. Enhancement type means: when VGS=0, the tube is in the cut-off state. After adding the correct VGS, most carriers are attracted to the gate, thereby “enhancing” the carriers in this area and forming a conductive channel. Depletion type means that when VGS=0, a channel is formed. When the correct VGS is added, most carriers can flow out of the channel, thereby “depleting” the carriers and turning the tube to cut-off.
