Analog and electronic circuits

What is the circuit called in which the input resistor of an op-amp inverting amplifier is replaced by a capacitor?

  1. ADifferentiator
  2. BIntegrator
  3. CComparator
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Answer: A. Differentiator

With a capacitor at the input and a resistor in the feedback, the output voltage is proportional to the rate of change (derivative) of the input voltage. This is a differentiator. Because its gain rises with frequency, it tends to amplify noise, so in practice a resistor is added in series with the input capacitor to limit high-frequency gain.

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