Working principle of depletion MOS transistor

The working principle of depletion MOS transistor is as follows:

During operation, no voltage is applied between the gate and source. Unlike enhanced MOS transistors, there is a conductive channel between the drain and source. Therefore, as long as a forward voltage is applied between the drain and source, a drain current will be generated. Moreover, when a forward voltage is applied between the gate and source, the conductive channel increases, and when a reverse voltage is applied, the conductive channel decreases, and the current flowing through it will be smaller. Compared with enhanced MOS transistors, it can have conductive channels within a certain range of positive and negative values.