GATE EC 2017 Set 2 — Question 40
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Electronic Devices → MOS Capacitor & MOSFET → Cutoff, Triode & Saturation
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Question
Assuming that transistors and are identical and have a threshold voltage of , the state of transistors and are respectivelyCircuit: two identical n-channel MOSFETs are connected in series between a supply and ground. The drain of is connected to and its gate is held at . The source of is connected to the drain of . The gate of is held at and its source is grounded. (Body effect and channel-length modulation are neglected.)
Correct answer
(C) Linear, Saturation
Solution
Let be the node between the two transistors and the common device constant.: and . Since always, (if on) is in saturation.: . Assume it is linear and equate currents: (the other root, , would turn off). Since , is indeed linear.Answer: (C) Linear, Saturation
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