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Which is true for the value of Avo for common source (Represented by A1) and common source with a source resistance (represented by A2).

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Which is true for the value of Avo for common source (Represented by A1) and common source with a source resistance (represented by A2).

(a) A1 = A2

(b) A1 > 2

(c) A1 < A2

(d) |A1| < |A2|

The question was posed to me in an internship interview.

My question is taken from Basic MOSFET Amplifier Configurations in division MOS Field Effect Transistors (MOSFETs) of Electronic Devices & Circuits

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Correct choice is (c) A1 < A2

Easy explanation: A1 = -gmRD and A2 = -gmRD/1+gmRS

Reference circuit for Common source configuration

Reference circuit for common source with source resistance RS

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