一种采用sigma-delta调制的数字磁通门磁传感器接口，用于弱磁场测量

IMTC/2002. Proceedings of the 19th IEEE Instrumentation and Measurement Technology Conference (IEEE Cat. No.00CH37276) Pub Date : 2002-08-07 DOI:10.1109/IMTC.2002.1006849

S. Kawahito, A. Cerman, Y. Tadokoro

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引用次数: 4

摘要

本文提出了一种利用微磁通门传感器的弱磁场测量系统和一种利用负反馈回路中的σ - δ调制的传感器信号处理技术。σ - δ调制器输出的低通滤波比特流对磁场的反馈改善了系统的线性度、滞回性和稳定性。通过在环路中使用积分器，可以在数字输出比特流中获得三阶噪声整形。地球磁场被成功测量。在/spl plusmn/ 100 /spl mu/T范围内，非线性误差小于0.4%。

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A digital fluxgate magnetic sensor interface using sigma-delta modulation for weak magnetic field measurement

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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IMTC/2002. Proceedings of the 19th IEEE Instrumentation and Measurement Technology Conference (IEEE Cat. No.00CH37276)

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