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Electronic Devices & Circuits FET & MOSFET

For the MOSFET in the ideal long-channel model with VGS = 5 V and VTH = 2 V, saturation requires VDS to be at least approximately?

A1 V
B2 V
C3 V
D5 V

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Correct Answer: C. 3 V

Explanation: The ideal saturation boundary is VDS >= VGS - VTH. Here the overdrive voltage is 3 V, so VDS must be at least about 3 V.

Reference: Standard MOSFET analysis: saturation condition

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