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A long-channel NMOS transistor is biased in the linear region with VDS=50 mV and is used as a resistance. Which one of the following statements is NOT correct?

1. If the device width W is increased, the resistance decreases.
2. If the threshold voltage is reduced, the resistance decreases.
3. If the device length L is increased, the resistance increases.
4. If VGS is increased, the resistance increases.

Correct answer: If VGS is increased, the resistance increases.

Solution

Increasing VGS enhances the channel conductivity in an NMOS transistor, which reduces the resistance, making the statement incorrect.

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