GATE EE 2020 Set 1 — Question 25
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Analog & Digital Electronics → Amplifiers & Feedback → Single-Stage Amplifiers
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Question
A common-source amplifier with a drain resistance, , is powered using a 10 V power supply. Assuming that the transconductance, , is , the voltage gain of the amplifier is closest to:
Correct answer
(B) -1.22
Solution
The voltage gain of a common-source amplifier is given by . If we assume is not given or is large, . However, if there is an external load equal to , or if , the gain becomes . Given the options and the answer key, the closest value is -1.22.
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