Multiple choice

Directions: Consider the CMOS circuit shown below, 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 mAV-2.

For small increase in VG beyond 1 V, which of the following gives the correct description of the region of operation of each MOSFET?

  1. Both the MOSFETs are in saturation region.

  2. Both the MOSFETs are in triode region.

  3. n -MOSFET is in triode and p −MOSFET is in saturation region.

  4. n -MOSFET is in saturation and p −MOSFET is in triode region.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

For small increase in $v_G$ beyond 1V the n-channel MOSFET goes into saturation as $V_{GS} \rightarrow +ive \ and\ p-MOSFET$ is always in active region or triode region.

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