GATE EC 2014 Set 2 — Question 49
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Analog Circuits → BJT & MOSFET Amplifiers → Biasing & DC Operating Point
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Question
For the MOSFETs shown in the figure, the threshold voltage V and mA/V. The value of (in mA) is _______.
Correct answer
0.88 to 0.92
Solution
1.Calculate the gate voltage for the top MOSFET using the voltage divider: V.
2.The gate of the bottom MOSFET is grounded, so V.
3.For the top PMOS: V, V V. Since V, it is ON.
4.For the bottom NMOS: V, V V. Since V, it is ON.
5.Assuming the NMOS is in saturation: mA.
6.Verify saturation for NMOS: . For saturation, V. This is satisfied if V.
7.Verify saturation for PMOS: mA. Since the actual current mA is less than the saturation current, the NMOS (which is in saturation) determines the current.
8.Therefore, mA.
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