Patent ID: 9605979
Date: 2017-03-28
CPC Classifications: G01D,G01R,G11B,H01F

Claim:
1. A magnetic field sensor comprising: a substrate; a first magnetoresistive element supported by the substrate; a second magnetoresistive element supported by the substrate and coupled in series with the first magnetoresistive element to form a voltage node between the first and second magnetoresistive elements and at which an output voltage is provided that changes in response to an external magnetic field; and a magnetic source producing a local magnetic field having a strength sufficient to bias the first magnetoresistive element to a resistive value that is substantially resistant to changing in response to the external magnetic field; wherein the magnetic source comprises a conductive trace supported by the substrate and configured to carry a current to provide the local magnetic field and the first magnetoresistive element is disposed atop the conductive trace.