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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Top Questions on Electrical Circuits

Questions Asked in GATE EE exam

A single-phase full-controlled thyristor converter bridge is used for regenerative braking of a separately excited DC motor with the following specifications: 

  • Rated armature voltage = 210 V
  • Rated armature current = 10 A
  • Rated speed = 1200 rpm
  • Armature resistance = 1 Ω
  • Input to the converter bridge = 240 V at 50 Hz

Assume that the motor is running at 600 rpm and the armature terminals are suitably reversed for regenerative braking.

If the armature current of the motor is to be maintained at the rated value, the triggering angle of the converter bridge (in degrees) should be ____________ (rounded off to two decimal places).

Motor and converter parameters: 

ParameterValue
Rated armature voltage210 V
Rated armature current10 A
Rated speed1200 rpm
Armature resistance1 Ω
Input to converter bridge240 V at 50 Hz

The armature of the DC motor is fed from the full-controlled bridge, and the field current is maintained constant.

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