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首页> 外文期刊>IEEE Transactions on Magnetics >Symmetric Response Magnetoresistance Sensor With Low 1/f Noise by Using an Antiphase AC Modulation Bridge
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Symmetric Response Magnetoresistance Sensor With Low 1/f Noise by Using an Antiphase AC Modulation Bridge

机译：使用反相式AC调制桥，对称响应磁阻传感器具有低1 / f噪声

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摘要

A new high-sensitive magnetic sensor which is referred to a symmetric response magnetoresistance (SRMR) sensor is proposed. This sensor uses giant magnetoresistance (GMR) elements which have symmetric field response. An ac magnetic field with frequency $f$ is applied to the GMR elements in order to modulate a small detecting magnetic field. Due to the symmetric response of the MR element, a carrier signal of the ac magnetic field is converted to $2f$ and the detecting signal is converted to $f$ . By using a full bridge circuit, where two pairs of GMR elements have opposite phase of the applied ac field, the $2f$ components can be eliminated at the differential output terminal of the bridge. Since this system converts the frequency range of the detecting magnetic field to higher one, its noise level, which is dominated by the 1/ $f$ noise, can be decreased. In this study, the SRMR sensor with the antiphase ac modulation bridge was fabricated and investigated. The effect of noise reduction and carrier signal suppression were confirmed by a circuit simulation based on the fabricated GMR element. A full-bridge circuit using four dual-spin-valve GMR elements was fabricated. It was confirmed that the carrier signal ( $2f$ components) was reduced to less than the signal level ( $f$ components). An increase in the noise level was found at the frequency range near $f$ , which may be due to slight asymmetry shown in the magnetoresistance (MR) response.
机译：提出了一种新的高敏感磁传感器，其被提出了对称响应磁阻（SRMR）传感器。该传感器使用具有对称场响应的巨大磁阻（GMR）元件。具有频率<内联公式XMLNS的交流磁场：MML =“http://www.w3.org/1998/math/mathml”xmlns：xlink =“http://www.w3.org/1999/xlink” > $ f $ 应用于GMR元素，以调制一个小检测磁场。由于MR元素的对称响应，AC磁场的载波信号被转换为<内联 - 公式XMLNS：MML =“http://www.w3.org/1998/math/mathml”xmlns：xlink = “http://www.w3.org/1999/xlink”> $ 2f $ 并且检测信号被转换为<内联-Formula XMLNS：MML =“http://www.w3.org/1998/math/mathml”xmlns：xlink =“http://www.w3.org/1999/xlink”> $ f $ 。通过使用完整的桥接电路，其中两对GMR元素具有应用的交流字段的相位相位，<内联公式XMLNS：MML =“http://www.w3.org/1998/math/mathml”xmlns： xlink =“http://www.w3.org/1999/xlink”> $ 2f $ 组件可以在差异上消除桥的输出端子。由于该系统将检测磁场的频率范围转换为更高的频率范围，其噪声级别由1 / <内联公式XMLNS：MML =“http://www.w3.org/1998/math/主导mathml“xmlns：xlink =”http://www.w3.org/1999/xlink“> $ f $ 噪音，可以减少。在该研究中，制造和研究了具有抗磷酶AC调制桥的SRMR传感器。通过基于制造的GMR元件的电路模拟确认了降噪和载波信号抑制的影响。制造了一种全桥电路，制造了四个双旋阀GMR元件。确认载波信号（<内联公式XMLNS：MML =“http://www.w3.org/1998/math/mathml”xmlns：xlink =“http://www.w3.org/1999/1999/ xlink“> $ 2f $ 组件）减少到小于信号级（<内联公式xmlns：mml =”http： //www.w3.org/1998/math/mathml“xmlns：xlink =”http://www.w3.org/1999/xlink“> $ f $ 组件）。在<内联公式XMLNS：MML =“http://www.w3.org/1998/math/mathml”xmlns：xlink =“http：//www.w3附近的频率范围内发现了噪声级别的增加.org / 1999 / xlink“> $ f $ ，这可能是由于磁阻（MR）响应中所示的轻微不对称性。

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