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Which outcome occurs when drain voltage surpasses gate-source voltage in an N-channel enhancement MOSFET used in a DC-DC buck converter?

A)MOSFET enters saturation region
B)MOSFET becomes fully cut-off
C)Subthreshold leakage increases sharply
D)Ohmic losses reach minimal values

💡 Explanation

The MOSFET enters saturation because the channel near the drain becomes pinched off, thus limiting further current increase as Vds increases. Therefore it operates as a constant current source rather than cutting off or reducing ohmic losses with further voltage increases .

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