MAGNETIC SENSOR SEVICE WITH FILTERING MEANS

摘要

The invention relates to a magnetic sensor device (10) comprising wires (11, 13) for the generation of a magnetic field with a first frequency fls a GMR sensor (12) operated with an input current of a second frequency f2, and an amplifier (26) for amplifying the output of the GMR sensor (12). A first filter (24) is used to prevent noise of the current source (23) from reaching the GMR sensor (12), and to prevent magnetic signals from the GMR sensor (12) from reaching the current source (23). Moreover, a second filter (25) is used to prevent the second frequency f2 from reaching the amplifier (26).