Discussion
What is the parasitic diode inherent in a power MOSFET?
Answer: C
The body region and the drain form a junction that conducts whenever the source is taken above the drain, so every power MOSFET contains a diode across it whether the designer wants one or not. The gate is insulated from everything, so no gate junction exists. In a bridge circuit this body diode is genuinely useful, carrying the freewheeling current an inductive load demands, but its slow recovery can also cause trouble at high frequency. A parasitic that is sometimes a feature and sometimes a nuisance has to be understood in both roles before a bridge is designed.
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