Patent ID: 7417424

Claim:
Device ( 16 ) for measuring at least one component of a magnetic field comprising a magnetoresistive or magnetoinductive sensor ( 102 ) and a measurement chain ( 28 ), one input of which is connected to the magnetoresistive or magnetoinductive sensor ( 102 ), an alternating power supply generator ( 116 ) for the magnetoresistive or magnetoinductive sensor ( 102 ) at an excitation frequency (f), and the output of which is able to provide a piece of information representative of the magnetic field in the region of the sensor, the measurement chain ( 28 ) comprising means ( 138 ; 178 ; 198 ) for isolating a frequency component of the signal from the sensor representative of the magnetic field for a single predetermined frequency (FI), characterized in that the excitation frequency (f) is greater than the predetermined frequency (FI) of the frequency component to be isolated.