The operation of a P channel MOSFET requires that the drain-source voltage (Vds) remains less than zero, meaning the source must be positive relative to the drain. This is essential for proper carrier flow from the source to the drain, as the carriers in a PMOS channel are holes. While conduction in the reverse direction is technically possible, it is not advisable for discrete devices due to the presence of a parasitic body diode that becomes forward biased under reverse conditions, leading to potential damage. In integrated circuits, the body can be connected to a different potential to maintain the body diode in reverse bias.
PREREQUISITESElectrical engineers, semiconductor device designers, and students studying power electronics and integrated circuit design will benefit from this discussion.