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What does an amplifier's gain-bandwidth product describe?

  • A.The maximum output power at the highest usable frequency
  • B.The ratio of the transconductance to the load resistance
  • C.The trade available between gain and frequency response
  • D.The product of the input and output impedances of the stage

Answer: C

The product being roughly constant means gain can be traded for bandwidth and back again, which is why a stage run at lower gain reaches higher frequencies. The other options do not describe any standard figure. A conserved product is the most useful kind of relation in design, because it says exactly what one improvement will cost elsewhere.

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