If a MOSFET structure is symmetrical, why is the body drain diode only in one direction?
In: Engineering
In a MOSFET, the body drain diode is a result of the p-n junction. It’s a byproduct of the MOSFET’s construction and is inherently unidirectional due to the electrical properties of the materials.
In a typical three-terminal MOSFET, the body is connected to the source to prevent the body voltage from affecting the threshold voltage. This connection effectively shorts out the body to source diode, making the body to drain diode prominent.
More details and diagrams here: https://electronics.stackexchange.com/questions/389406/how-should-i-understand-the-intrinsic-body-diode-inside-a-mosfet
Latest Answers