MOSFET

What is the definition of the transconductance gm of a MOSFET?

  1. AThe ratio of the change in drain current to the change in gate voltage
  2. BThe drain voltage divided by the drain current
  3. CThe capacitance of the gate insulator
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Answer: A. The ratio of the change in drain current to the change in gate voltage

Transconductance is gm = ΔID / ΔVGS and shows how much a change in gate voltage changes the drain current. The higher gm, the greater the gain of an amplifier, so it is an important measure of transistor performance.

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