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Analog ElectronicsComparators & Waveform Generators

An op-amp relaxation oscillator typically generates a square wave by combining a Schmitt-trigger action with?

  • ARC charging and discharging
  • BA transformer rectifier only
  • CA current mirror with no capacitor
  • DA crystal operated only at series resonance
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Correct Answer: A. RC charging and discharging
Explanation: The capacitor repeatedly charges and discharges between hysteresis thresholds, causing the comparator output to switch and sustain oscillation.
Reference: Standard analog electronics: relaxation oscillator
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