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A simple direct-digitizer for Giant magneto-resistance based sensors

机译:用于基于巨型磁阻的传感器简单的直接数字化器

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A Direct Digitizer suitable for Giant magneto-resistive (GMR) sensors is proposed in this paper. The proffered digitizer integrates a GMR sensor, in the form of a full-bridge, with a novel circuit based on enhanced dual-slope technique and obtains a linear digital indication of the magnetic field being measured. The scheme does not use a separate ADC for digitization. A detailed mathematical methodology of the scheme has been reported to validate the linear transfer relation of the proposed scheme. Simulation study of the proposed circuit has been performed and the results show that output-non linearity is as small as 0.004 %. Further, the performance is validated by experimentation with emulated and actual GMR sensor bridges and results are reported. Output is found to be linear with-respect-to the magnetic field and the worst-case error is within acceptable limits. The proposed scheme can be employed as a superior alternative to conventional (instrumentation amplifier) based interface circuits for GMR sensors.
机译:本文提出了一种适用于巨磁电阻(GMR)传感器的直接数字化器。提供的数字转换器以全桥的形式集成了GMR传感器,具有基于增强的双斜率技术的新电路,并获得正在测量的磁场的线性数字指示。该方案不使用单独的ADC进行数字化。据报道,该方案的详细数学方法验证了所提出的方案的线性转移关系。已经进行了所提出的电路的仿真研究,结果表明输出 - 非线性小于0.004%。此外,通过使用仿真和实际GMR传感器网桥进行实验验证性能和结果。发现输出是线性相对于磁场,最坏情况误差是可接受的限制。所提出的方案可以作为GMR传感器的基于基于常规(仪表放大器)的接口电路的优越替代方案。

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