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Impedance

For the NMOSF...

Question

For the NMOSFET in the circuit shown, the threshold voltage is $V_{t h} w h e r e V_{t h} > 0$ . The source voltage $V_{S S}$ is varied from $0 t o V_{D D}$ . Neglecting the channel length modulation, the drain current $I_{D}$ as a function of $V_{S S}$ is represented by

A

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B

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C

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D

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Solution

The correct option is C
Ans : (a)

$V_{G S} = V_{D S}$
Hence MOS transistor is in saturation.
In saturation, $I_{D} = k (V_{G S} - V_{T})^{2} = k (V_{D D} - V_{s s} - V_{T})^{2}$
As, $V_{s s}$ increases $I_{D}$ decreases (Not linearly because square factor )
Hence option (a) is correct.

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