HIGH_BANDWIDTH_PEAK_DETECTOR

Published:2009/7/6 2:48:00 Author:May | From:SeekIC

The high-speed peak detector uses a highly accurate, fast s/h amplifter controlled by a highspeed comparator. The s/h amplifter holds the peak voltage, until the comparator switches the amp to its sample mode, to capture a new, higher voltage level. The circuit handles all common-wave shapes and exhibits 5% accuracy from 50 Hz to 2 MHz. The comparator's output decreases when the input signal exceeds the value of the currently held output. This transition puts the s/h amplifter into sample mode. Once the output reaches the value of the input, or the input signal falls below the output's level, the comparator's output increases; the high output brings the s/h amplifter back to the hold mode, thereby holding the peak value of the input signal. Reset the circuit by lowering the value of pin 4 of the NE522 comparator, which in turn allows the NE5060 s/h amplifter to acquire the input. The NE522 comparator has an open-collector output.



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