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Analog ElectronicsOperational Amplifier Applications

An ideal peak detector using an op-amp, diode and capacitor is intended to hold approximately?

  • AThe maximum value reached by the input waveform
  • BThe RMS value of every waveform automatically
  • COnly the zero crossing
  • DThe input frequency as a voltage
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Correct Answer: A. The maximum value reached by the input waveform
Explanation: The diode-capacitor feedback arrangement charges the storage capacitor to the input peak and ideally holds that level between larger peaks.
Reference: Standard analog electronics: peak detector
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