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US 7,038,448 B2Granted
Magnetic field sensor
AssigneeSentron AG
InventorsChristian Schott, Radivoje Popovic, Robert Racz
Life of this patent
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Abstract
A magnetic field sensor for measuring at least two components of a magnetic field comprises a ferromagnetic core mounted on a semiconductor chip, an exciter coil to which a current can be applied and two read-out sensors. The ferromagnetic core is ring-shaped. The exciter coil is preferably formed from conductor tracks of the semiconductor chip and from bonding wires.
Claims12
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.
1 more element
Dependencies are inferred from the claim text.