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What is the common-mode component of two input signals?

  • A.The part below the amplifier's threshold
  • B.The part identical at both inputs
  • C.The part that differs between the two inputs
  • D.The part above the supply's midpoint

Answer: B

Any pair of inputs can be resolved into a common part, equal at both, and a differential part, equal and opposite - and the two are handled quite differently by the stage. Neither the supply midpoint nor a threshold enters into the definition. Resolving a pair of signals into these two components is the first step in every calculation here, and it works because the stage's response to each is independent.

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