GATE EE 2022 Set 1 — Question 12
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Analog & Digital Electronics → Amplifiers & Feedback → Single-Stage Amplifiers
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Question
For an ideal MOSFET biased in saturation, the magnitude of the small signal current gain for a common drain amplifier is
Correct answer
(D) infinite
Solution
In a common drain (source follower) amplifier, the input signal is applied to the gate terminal. For an ideal MOSFET, the gate is insulated by a layer of silicon dioxide, meaning the steady-state and small-signal gate current is zero (). The current gain is defined as the ratio of output current (source current ) to input current ():Thus, the current gain is infinite.
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