Analog and electronic circuits

Which correctly describes the input offset voltage of an op-amp?

  1. AThe small voltage that must be applied between the inputs to correct for the output not being 0 when the inputs are equal
  2. BThe maximum voltage that can be applied to the input
  3. CThe supply voltage of the op-amp
Show answer and explanation

Answer: A. The small voltage that must be applied between the inputs to correct for the output not being 0 when the inputs are equal

Because of slight mismatches between internal components, a real op-amp's output is not 0 even when both inputs are at the same voltage. This error referred to the input is the input offset voltage. In circuits that amplify DC with high gain, it causes large errors.

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