Magnetic field sensor
Magnetic field sensor
Magnetic field sensor
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Philips SemiconductorsProduct specification<strong>Magnetic</strong> <strong>field</strong> <strong>sensor</strong>KMZ10A1APPLICATION INFORMATIONA problem with measuring weak magnetic <strong>field</strong>s is that precision is limited by drift in both the <strong>sensor</strong> and amplifier offset.In these instances, it is possible to take advantage of the ‘flipping’ characteristics of the KMZ10 series to generate anoutput that is independent of offset. The <strong>sensor</strong>, located in a coil connected to a current pulse generator producingmagnetic <strong>field</strong> pulses periodically reversed by alternate positive and negative going current pulses, is continually flippedfrom its normal to its reversed polarity and back again. The polarity of the offset however, remains unchanged, so theoffset itself can be eliminated by passing the output signal through a filter circuit.handbook, full pagewidthH xcoilH, y ,,,<strong>sensor</strong>V oM xoffsetH y1 2 3 4M x(a)(c)currentpolarizationV ooffset(b)timeMBC925(a) Set-up.(b) Pulse diagram.(c) Sensor output characteristics.Fig.8 Measuring weak magnetic <strong>field</strong>s with the KMZ10A1.1998 Apr 06 6
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