Question:medium

Which one of the following statements is true about the small signal voltage gain of a MOSFET based single stage amplifier?

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Remember: Common Source → Inverting, Common Gate → Non-inverting. The sign of voltage gain helps identify the amplifier type.
Updated On: Feb 3, 2026
  • Common source and common gate amplifiers are both inverting amplifiers
  • Common source and common gate amplifiers are both non-inverting amplifiers
  • Common source amplifier is inverting and common gate amplifier is non-inverting amplifier
  • Common source amplifier is non-inverting and common gate amplifier is inverting amplifier
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The Correct Option is C

Solution and Explanation

In a MOSFET amplifier: The Common Source (CS) configuration has its gate as the input, drain as the output, and source connected to ground (or a small-signal ground via a capacitor). The voltage gain in this configuration is negative, hence it is an inverting amplifier.
The Common Gate (CG) configuration has its source as the input, drain as the output, and gate connected to ground (AC ground). The voltage gain here is positive, meaning it is a non-inverting amplifier.
Hence, the correct statement is:
Common source amplifier is inverting and common gate amplifier is non-inverting.
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