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What is the body effect in a MOSFET?

  • A.The threshold voltage rising with source-to-substrate bias
  • B.The channel resistance falling as the substrate warms
  • C.The gate capacitance changing with drain voltage
  • D.The drain current saturating beyond the pinch-off point

Answer: A

When the source is not tied to the substrate, the reverse bias between them widens the depletion region and raises the threshold voltage, which matters in stacked switches and in integrated circuits where a common substrate is unavoidable. The other options describe other effects entirely. An unwanted dependence on a terminal often ignored in the simple model is worth knowing about, since it is what makes series MOSFET switches behave worse than a single one suggests.

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