Working principle of enhanced MOS transistor

The working principle of enhanced MOS transistor is as follows:

When there is no voltage applied between the gate and source during operation, the PN junction between the drain and source is reversed, so there is no conductive channel. Even if a voltage is applied between the drain and source, the conductive channel is closed and no current flows through.

 When a forward voltage is applied between the gate and source to a certain value, a conductive channel is formed between the drain and source, and the gate source voltage just formed by the conductive channel is called the turn-on voltage VGS. The higher the voltage between the gate and source, the wider the conductive channel, thereby increasing the current flowing through it.