Patent ID: 7005958

Claim:
A magnetic field sensing device comprising: a first sensor and a second sensor formed in a common plane on a single semiconductor substrate; said first sensor having a first bridge arrangement comprising GMR material formed on said substrate, said GMR material having a free layer having a crystal anisotropy field and having an easy axis of effective anisotropy field in a first direction, said first sensor being sensitive to first magnetic field components perpendicular to said first direction; means for producing a current flow through said first sensor and sensing variations in the resistivity of said first sensor due to said first magnetic field components with an output of said first bridge arrangement representing said first magnetic field components; said second sensor having a second bridge arrangement comprising said GMR material formed on said substrate, said GMR material having a free layer having said crystal anisotropy field and having an easy axis of effective anisotropy field in a second direction substantially perpendicular to said first direction, said second sensor being sensitive to second magnetic field components perpendicular to a sensitive direction of said first sensor, means for producing a current flow through said second sensor and sensing variations in the resistivity of said second sensor due to said second magnetic field components with an output of said second bridge arrangement representing said second magnetic field components.