Magnetic field sensing device
First Claim
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1. An integrated device for measuring magnetic fields comprising:
- a first sensor unit comprising a first full bridge circuit and a second sensor unit comprising a second full bridge circuit;
said first sensor unit and said second sensor unit comprising magneto resistive material formed directly on a single substrate and having the same crystal anisotropy field;
said first sensor unit comprising at least one sensing element having an elongated shape and having a total anisotropy field in a first direction;
said first sensor unit having an output related to magnetic field components perpendicular to said first direction;
said second sensor unit comprising at least one sensing element having an elongated shape and having a total anisotropy field in a second direction with said second direction being substantially perpendicular to said first direction;
said second sensor unit having an output related to magnetic field components in a direction substantially perpendicular to said second direction; and
said integrated device being independent of a biasing magnet.
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Abstract
Two sensor units are formed from magnetoresistive material. Elements of the first sensor unit have a total anisotropy field in a first direction. Elements of the second sensor unit have a total anisotropy field in a second direction. An integral coil sets a direction of magnetization in the elements of the first and second sensor units. An output of the first sensor unit is representative of magnetic field components perpendicular to the first direction and an output of the second sensor is representative of magnetic field components perpendicular to the second direction.
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Citations
9 Claims
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1. An integrated device for measuring magnetic fields comprising:
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a first sensor unit comprising a first full bridge circuit and a second sensor unit comprising a second full bridge circuit; said first sensor unit and said second sensor unit comprising magneto resistive material formed directly on a single substrate and having the same crystal anisotropy field; said first sensor unit comprising at least one sensing element having an elongated shape and having a total anisotropy field in a first direction; said first sensor unit having an output related to magnetic field components perpendicular to said first direction; said second sensor unit comprising at least one sensing element having an elongated shape and having a total anisotropy field in a second direction with said second direction being substantially perpendicular to said first direction; said second sensor unit having an output related to magnetic field components in a direction substantially perpendicular to said second direction; and said integrated device being independent of a biasing magnet. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification