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

1. Common source and common gate amplifiers are both inverting amplifiers
2. Common source and common gate amplifiers are both non-inverting amplifiers
3. Common source amplifier is inverting and common gate amplifier is non-inverting amplifier
4. Common source amplifier is non-inverting and common gate amplifier is inverting amplifier

Correct answer: Common source amplifier is inverting and common gate amplifier is non-inverting amplifier

Solution

The common source amplifier inverts the input signal, producing a 180-degree phase shift, while the common gate amplifier does not invert the signal, maintaining the same phase as the input. This distinction is fundamental to understanding the behavior of these amplifier configurations.

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