Patent ID: 7038448
Filing Date: 2006-05-02
Classification: G01R

Abstract:
1. A magnetic field sensor for measuring at least two components of a magnetic field, comprising a ferromagnetic core for concentrating the magnetic field, mounted on a surface of a semiconductor chip, having a generally flat shape extending substantially in a first plane and having an inner and an outer edge, the inner edge forming a boundary of an opening, two read-out sensors for measuring a first and a second component of the magnetic field in said plane, the read-out sensors integrated in the semiconductor chip and located close to the outer edge of the ferromagnetic core, an exciter coil having at least one winding, a part of the winding formed by a conductor track of the semiconductor chip and another part of the winding running outside the surface of the semiconductor chip, and a current source for applying an AC current to the exciter coil, the exciter coil and the ferromagnetic core serving for chopping the first and second component of the magnetic field.