Method and Apparatus for Magnetic Sensor Producing a Changing Magnetic Field
First Claim
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1. A magnetic field sensor comprising:
- a semiconductor substrate;
a coil configured to provide a changing magnetic field in response to a changing current in the coil; and
a magnetic field sensing element supported by the substrate to sense the magnetic field as affected by the presence of a ferromagnetic target.
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Abstract
Methods and apparatus for detecting a magnetic field include a semiconductor substrate, a coil configured to provide a changing magnetic field in response to a changing current in the coil; and a magnetic field sensing element supported by the substrate. The coil receives the changing current and, in response, generates a changing magnetic field. The magnetic field sensing element detects the presence of a magnetic target by detecting changes to the magnetic field caused by the target and comparing them to an expected value.
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Citations
20 Claims
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1. A magnetic field sensor comprising:
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a semiconductor substrate; a coil configured to provide a changing magnetic field in response to a changing current in the coil; and a magnetic field sensing element supported by the substrate to sense the magnetic field as affected by the presence of a ferromagnetic target. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of detecting a magnetic field comprising:
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providing a semiconductor substrate; driving a changing current through a coil so that the coil generates an changing magnetic field; and sensing, with a magnetic field sensing element supported by the substrate, variations in the changing magnetic field due to a proximity of a ferromagnetic target. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification