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首页> 外文期刊>IEEE Transactions on Magnetics >A Digitally Compensated AMR Magnetometer
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A Digitally Compensated AMR Magnetometer

机译:数字补偿AMR磁力计

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This paper considers the possibilities of using digital feedback for precise anisotropic magneto-resistance (AMR) magnetometers using commercial off-the-shelf (COTS) components. Requiring only a few analog parts, most of the signal processing is done digitally within an STM32 microcontroller. Because most of the precision is made by the feedback circuit, the analog-to-digital converter (ADC) can be a low-cost type. The compensation source is made with a pulsewidth modulation-driven H-bridge sourced from a voltage reference, so the cost reduction when compared to a “full-analog” design is large. The demodulation of a flipped-AMR signal is done with software after the AD conversion because it improves the offset stability and brings the reduction of the preamp’s and ADC’s LF noise. This paper presents the full characterization of a real instrument, including its noise, linearity, stability, and power consumption.
机译:本文考虑了将数字反馈用于使用现成的商用(COTS)组件的精确各向异性磁阻(AMR)磁力计的可能性。仅需几个模拟部分,大多数信号处理就可以在STM32微控制器内以数字方式完成。由于大多数精度是由反馈电路决定的,因此模数转换器(ADC)可以是低成本的。补偿源由源自电压基准的脉宽调制驱动的H桥制成,因此与“全模拟”设计相比,成本降低很大。翻转后的AMR信号的解调是在AD转换后用软件完成的,因为它可以改善失调稳定性,并降低前置放大器和ADC的LF噪声。本文介绍了真实仪器的完整特性,包括其噪声,线性,稳定性和功耗。

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