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Analog ElectronicsOperational Amplifier Applications

In a practical peak detector, a high input-resistance buffer after the hold capacitor is useful mainly to?

  • AReduce discharge of the stored voltage by the load
  • BIncrease diode forward drop
  • CForce the capacitor to discharge immediately
  • DCreate positive feedback oscillation
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Correct Answer: A. Reduce discharge of the stored voltage by the load
Explanation: A buffer isolates the storage capacitor from the load, reducing loading and helping the held peak voltage decay more slowly.
Reference: Standard analog electronics: buffered peak detector
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