Analog and electronic circuits

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

  1. AIntegrator
  2. BDifferentiator
  3. CComparator
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Answer: A. Integrator

With a resistor R at the input and a capacitor C in the feedback path, the output voltage is proportional to the time integral of the input voltage (an inverting integrator). Conversely, with a capacitor at the input and a resistor in the feedback, the circuit becomes a differentiator. Integrators are used for waveform shaping, filters, dual-slope ADCs and more.

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