An FPGA Based Peak Detector for Magnetostrictive Current Sensors

Cristian Zet, Cătălin Damian, Cristian Foşalău

Abstract

The paper describes a FPGA based peak detector. The present design is aimed for signal processing coming from a magnetoresistive current sensor, but it can be used for any kind of signal. The maximum value of the signal is determined using the derivative sign change from positive to negative means positive peak and sign change from negative to positive means negative peak while the signal is positive or respectively negative. Two thresholds are used in order to separate the absolute peak from other relative peaks in the waveform. The peak detection is performed comparing the signal with a threshold and selecting sequences that exceed it for positive maximum or are located under it for negative minimum. The peak value can be directly displayed on a digital display, or transmitted via LPT interface to computer or converted to analog signal again with a D/A converter.

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IMEKO-TC4-2005-032.pdf

DOI

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IMEKO TC

TC4 - Measurement of Electrical Quantities

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