Patent ID: 8680857

Claim:
A magnetoresistive sensor comprising: first and second magnetoresistive elements, each of which is coupled at a respective first end to a common ground terminal and comprises at least one magnetoresistive segment, each overlying a corresponding segment of an excitation coil, wherein the resistance of the magnetoresistive segments in each of the first and second magnetoresistive elements is the same and the resistance of the segments of the excitation coil corresponding to the first magnetoresistive element is the same as the resistance of the segments of the excitation coil corresponding to the second magnetoresistive element, and wherein the or each magnetoresistive element is separated from a carrier substrate by an isolation layer, a thickness of the isolation layer being selected such that a product of the total resistance of the or each magnetoresistive element and the capacitance between the or each magnetoresistive element and the substrate is less than the reciprocal of a highest frequency in a spectrum of an excitation current carried by the excitation coil.