GATE EC 2022 Set 1 — Question 59
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Analog Circuits → BJT & MOSFET Amplifiers → Small-Signal & Hybrid-Pi Model
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Question
Consider the circuit shown with an ideal long channel nMOSFET (enhancement-mode, substrate is connected to the source). The transistor is appropriately biased in the saturation region with and such that it acts as a linear amplifier. is the small-signal ac input voltage. and represent the small-signal voltages at the nodes A and B, respectively. The value of is ________ (rounded off to one decimal place).
Correct answer
-2.1 to -1.9
Solution
In saturation the MOSFET is a voltage-controlled current source with small-signal drain current (ideal long channel: no channel-length modulation; substrate tied to source: no body effect). The gate draws no current, so the same flows through the drain resistor and the source resistor. is an ac ground, so
- node A (drain):
- node B (source):
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