Multiple choice

Directions: Consider the CMOS circuit shown, where the gate voltage v0 of the n-MOSFET is increased from zero, while the gate voltage of the p−MOSFET is kept constant at 3 V. Assume that, for both transistors, the magnitude of the threshold voltage is 1 V and the product of the trans-conductance parameter is 1 mA V-2.

Estimate the output voltage V0 for VG = 15 V.

  1. 4 - $\dfrac{1}{\sqrt2}$
  2. 4 + $\dfrac{1}{\sqrt2}$
  3. 4 - $\dfrac{\sqrt3}{2}$
  4. 4 + $\dfrac{\sqrt3}{2}$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Vo = 4 + √3/2 = 4 + 0.866 = 4.866 V This voltage is near to supply voltage, while when it increases to more than 15 V, then the output will decrease.

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