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Wide-range-peak-detector

2017-09-04 19:55  
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ICl and IC2 form an inverting half-wave precision-rectifier/peak-detector circuit. Negative input-signal, swings with peaks larger than the voltage on Cl, cause this capacitor to charge to the new peak voltage. The capacitor holds this voltage until a larger signal peak arrives. When the input swings high, comparator IC4 detects the zero crossing and triggers the one-shot multivibrator. The one shot closes FET switch S2, thereby causing C2 to charge to the peak voltage held on Cl, during the previous half cycle.
Wide-range-peak-detector

The second one shot then produces a pulse that causes FET switch Sl to discharge Cl. Ifthe next negative signal-input peak is different from the previous one, the circuit captures it and it appears at IC3`s output during the next half cycle. The peak detector thus resets itself once every input-waveform cycle. Note that the zero crossings are necessary to trigger the switches; therefore, the circuit is usable only with ac signals.



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