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Magnetoresistive (MR) sensor temperature compensation and magnetic cross-term reduction techniques utilizing selective set and reset gain measurements
Magnetoresistive (MR) sensor temperature compensation and magnetic cross-term reduction techniques utilizing selective set and reset gain measurements
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机译:利用选择性设置和复位增益测量的磁阻(MR)传感器温度补偿和磁交叉项减少技术
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摘要
A measurement technique for normalizing the sensitive-axis output of a magnetoresistive (MR) sensor which greatly reduces both temperature effects and magnetic contributions from the insensitive-axis cross-terms. Specifically, the normalization techniques disclosed may be effectuated by direct measurement with no prior knowledge of the sensor constants being required and may be performed for a single sensor with multiple sensors not being required in order to estimate the cross-axis fields for each of the other sensors. The technique can additionally provide an output proportional to the insensitive-axis field as well as that of the sensitive-axis and, when combined with knowledge of ambient field strengths, can be used to determine fundamental MR sensor constants which then allows for correction of higher-order sensor non-linearities. The techniques disclosed are particularly conducive to low power supply availability applications such as battery operation.
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