D-MOSFET

It is one type of MOSFET which can be worked in both enhancement mode as well as depletion mode .In the N-channel D-MOSFET it consists of P-type semiconductor material (i.e p-type substrate) on the right side and as well as an insulated gate terminal on the left side of the N-type semiconductor channel .In this type of D-MOSFET here current flowing from source terminal to the drain terminal through the narrow conducting channel between the gate terminal and the P-type semiconductor region or substrate which lies on the right side of the N-type of channel.In the D-MOSFET it has three terminals such as gate terminal ,drain terminal and source terminal.In this type D-MOSFET gate terminal is constructs by thin layer of metal oxide(generally silicon dioxide) is deposited on the left side of the N-type channel pieces. In the D-MOSFET gate terminal is taken out from this deposited metal oxide layer .We know that silicon dioxide is an insulator ,so it like as capacitor where gate terminal act as one plate of capacitor and N-type channel pieces is act as another plate of this capacitor and as well as the silicon dioxide or metallic oxide is act as dielectric .In this type of D-MOSFET gate terminal is insulated from the N-type channel pieces,so we can supply either positive potential or negative potential .As a result D-MOSFET can be worked in both enhancement mode as well as depletion mode where as JFET can be worked in depletion mode only.So D-MOSFET has more advantage than JFET .D-MOSFET have more application in this electronics and communication field.D-MOSFET have also P-channel D-MOSFET which consists a pieces of P-type semiconductor material with N-type semiconductor region (i.e substrate) on the right side and the insulated gate terminal is on the left side of it.