MOSFET

Which is a characteristic of a MOSFET source follower (common-drain) circuit?

  1. AIts voltage gain is slightly less than 1 and its output impedance is low
  2. BIts voltage gain is very large and its output is inverted
  3. CIts current gain is zero
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Answer: A. Its voltage gain is slightly less than 1 and its output impedance is low

In a source follower, the source voltage follows the gate voltage closely, so the voltage gain is slightly less than 1. With high input impedance and low output impedance, it is used as a buffer. It corresponds to the emitter follower in bipolar circuits.

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