p-channel Depletion Mode MOSFET

The cross-sectional view of the p-channel depletion mode MOSFET fabricated on

n-type substrate is shown in Figure and Figure also shows the corresponding symbol of the device.

The basic idea behind the operation of the p-channel depletion mode MOSFET is to connect the p-type source and p-type drain diffusions by intentionally doped p-region as shown in Figure as a p-channel.

Hence in p-channel depletion mode MOSFET the p-type channel is already exists without application of the negative gate bias. Now if a potential difference is applied between source and drain terminals then this would cause the holes to flow in the channel between source and drain terminals and thus constitute the drain current.