Abstract
This paper presents a weak magnetic field measurement system using micro-fluxgate sensors and a sensor signal processing technique using the sigma-delta modulation in the negative feedback loop. The feedback of low-pass filtered bitstream output of a sigma-delta modulator to the magnetic field improves system linearity, hysteresis and stability. The third-order noise shaping can be obtained in the digital output bit-stream by the use of an integrator in the loop. Earth's magnetic field is successfully measured. The non-linearity error is less then 0.4 % in the range of /spl plusmn/ 100 /spl mu/T.
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