The threshold voltage of an N-channel enhancement mode MOSFET is 0.5 V. When the device is biased at a gate voltage of 3 V, pinch-off would occur at a drain voltage of

• A. 4.5 V
• B. 1.5 V
• C. 3.5 V
• D. 2.5 V

Answer: (D)

Equation is given by:
Vds = Vgs - Vt
Vds = 3 - 0.5
Vds = 2.5 V