Enhancement Mode of D-MOSFET

This figure shows the enhancement mode of operation of N-channel D-MOSFET.Whole construction is similar to the depletion mode of operation of D-MOSFET.But in this enhancement mode of operation of D-MOSFET ,it has no conducting channel .The whole construction acts as capacitor .In this N-channel D-MOSFET ,gate terminal is in positive potential ,it produce negative charges in the N-type conducting channel as shown in above figure .The free electrons drawn in to the N-type conducting channel. by these negative charges.In enhancement mode of operation of the D-MOSFET,free electrons are added in the conducting channel. .As the result amount of the the free electrons are increased in the conducting channel .So N-type conducting channel is enhances or increase .When positive potential on the gate terminal is enhances ( i.e increase) and the amount of the free electrons in the conducting channel is enhanced .From the above discussion we can noted that the amount of the current conduction from the source terminal to the drain terminal through the N-type conducting channel is controlled by the amount of the positive potential on the gate terminal .

When positive potential on the gate terminal is enhances the conductivity of the channel is also enhance .This is the main differences of the D-MOSFET to the JFET .JFET can not be worked in the enhancement mode operation on the opsitive gate termianl.So we can noted that the positive potential on the gate terminal operation is called the enhancement mode of operation of the D-MOSFET.