GATE EC 2019 Set 1 — Question 50
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Electronic Devices → MOS Capacitor & MOSFET → Threshold Voltage
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Question
In the circuits shown, the threshold voltage of each nMOS transistor is . Ignoring the effect of channel length modulation and body bias, the values of and , respectively, in volts, are
Correct answer
(C) 1.8 and 2.4
Solution
For the first circuit (top), we have two nMOS transistors in series.
1.The first transistor has its drain and gate connected to . Its source voltage is .
2.The second transistor has its gate and drain connected to the source of the first transistor, so .
3.The output voltage is at the source of the second transistor: .
For the second circuit (bottom), we have three nMOS transistors in series. Each transistor has its gate connected to a source.1.For the first transistor: .
2.For the second transistor: and . Since and , the source voltage .
3.For the third transistor: and . Similarly, .
Thus, and .Continue learning with Success Tracker
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