MOSFET

Besides the gate, source and drain, what is the fourth terminal of a MOSFET?

  1. AEmitter
  2. BBody (substrate)
  3. CCollector
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Answer: B. Body (substrate)

A MOSFET is a four-terminal device: gate, source, drain, and the substrate in which the channel forms (the body or back gate). In discrete parts the body is often internally connected to the source, so the device looks like it has three terminals. The body potential affects the threshold voltage (the body effect).

  • A. The emitter is a bipolar transistor terminal.
  • B. Correct. The fourth terminal is the body (substrate).
  • C. The collector is a bipolar transistor terminal.
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More MOSFET questions

  1. Which carriers carry the current in the channel of an n-channel MOSFET?
  2. What does the "C" (complementary) in CMOS mean?
  3. When a MOSFET is used as a switch, which statement correctly describes its on-resistance?
  4. For a typical MOSFET in an integrated circuit, which statement about the source and drain is correct?
  5. What is the condition for a long-channel nMOSFET to operate in the saturation region? (Assume VGS > Vth.)