channel, thereby enhancing the conductivity of the channel and, as a result, causing an increase the channel ID. This mode of operation of the depletion MosFET is referred to as the enhancement mode operation, whereas the normal mode of operation with negative VGs is called the depletion mode operation.
In conclusion, the amount of the drain current ID that can flow through the channel is controlled by the magnitude of the voltage VGs, which may be positive or negative. The drain and transfer characteristics of an n-channel depletion MOSFET, which are similar to the JFET characteristics, are shown in Figure 7-37 below
Since the gate in depletion MOSFET is insulated from the channel, the gate-to-source voltage VGs can also be positive, in which case more charge carriers are attracted to the