Abstract: The structure and operating principle of perm alloy magnetoresistive sensor are introduced, and its characteristics are studied. The main parameters of geomagnetic field are simple. The circuit for eliminating the interference of strong magnetic field on this kind of magnetoresistive sensor is designed, which is conducive to the popularization and application of permalloy integrated magnetoresistive devices.Key words: magnetoresistance effect; perm alloy; impulse circuit; geomagnetic field geom agnetic field
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