MOSFET

Which carriers carry the current in the channel of an n-channel MOSFET?

  1. AHoles
  2. BIons
  3. CElectrons
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Answer: C. Electrons

In an n-channel MOSFET, the gate voltage attracts electrons to the surface of the p-type substrate to form an inversion layer, and these electrons flow from source to drain to carry the current. In a p-channel MOSFET, holes carry the current.

  • A. Holes carry the current in a p-channel MOSFET.
  • B. Ions do not carry current in a MOSFET channel.
  • C. Correct. Electrons carry the current in an n-channel device.
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  1. What does the "C" (complementary) in CMOS mean?
  2. When a MOSFET is used as a switch, which statement correctly describes its on-resistance?
  3. For a typical MOSFET in an integrated circuit, which statement about the source and drain is correct?
  4. What is the condition for a long-channel nMOSFET to operate in the saturation region? (Assume VGS > Vth.)
  5. How does the threshold voltage change when the impurity concentration of the channel region (p-type substrate) of an nMOSFET is increased?