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Given, Vgs is the gate-source voltage, Vds is the drain source voltage, and Vth is the threshold voltage of an enhancement type NMOS transistor, the conditions for transistor to be biased in saturation are

1. Vgs < Vth; Vds ≥ Vgs − Vth
2. Vgs > Vth; Vds ≥ Vgs − Vth
3. Vgs > Vth; Vds ≤ Vgs − Vth
4. Vgs < Vth; Vds ≤ Vgs − Vth

Correct answer: Vgs > Vth; Vds ≥ Vgs − Vth

Solution

The correct option is right because for an enhancement type NMOS transistor to operate in saturation, the gate-source voltage (Vgs) must exceed the threshold voltage (Vth) to turn the transistor on, and the drain-source voltage (Vds) must be at least equal to the difference between Vgs and Vth to maintain saturation.

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