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MCQ Practice Question
Electronic Devices & CircuitsFET Amplifiers

In a common-source MOSFET amplifier with a resistive drain load and no source degeneration, the output voltage is typically?

  • AApproximately 180 degrees out of phase with the input
  • BExactly in phase with the input
  • C90 degrees ahead at all frequencies
  • DIndependent of the input
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Correct Answer: A. Approximately 180 degrees out of phase with the input
Explanation: Increasing gate voltage raises drain current, increasing the drain-resistor drop and lowering drain voltage, so the stage is inverting.
Reference: Standard analog electronics: common-source amplifier
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