GATE EC 2017 Set 2 — Question 9
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Electronic Devices → MOS Capacitor & MOSFET → Cutoff, Triode & Saturation
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Question
An -channel enhancement mode MOSFET is biased at and , where is the gate-to-source voltage, is the drain-to-source voltage and is the threshold voltage. Considering channel length modulation effect to be significant, the MOSFET behaves as a
Correct answer
(C) current source with finite output impedance
Solution
The MOSFET is biased in the saturation region because (channel exists) and (drain-to-source voltage is high enough to pinch off the channel at the drain end). In the saturation region, a MOSFET ideally acts as a voltage-controlled current source. When channel length modulation is considered significant, the drain current is no longer independent of and is given by:
This dependence on results in a finite output resistance . Therefore, the MOSFET behaves as a current source with a finite output impedance.
This dependence on results in a finite output resistance . Therefore, the MOSFET behaves as a current source with a finite output impedance.
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