Magnetic field sensor having calibration circuitry and techniques
First Claim
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1. A magnetic field sensor, comprising:
- at least one magnetic field sensing element configured to generate a measured magnetic field signal responsive to and representing an external magnetic field and to generate a reference magnetic field signal responsive to and representing a reference magnetic field;
at least one analog-to-digital converter responsive to the measured magnetic field signal to generate a digital measured magnetic field signal and responsive to the reference magnetic field signal to generate a digital reference magnetic field signal; and
a calibration circuit responsive to the digital measured magnetic field signal and to the digital reference magnetic field signal to combine the digital measured magnetic field signal and the digital reference magnetic field signal in order to generate a calibrated magnetic field signal that represents the external magnetic field;
wherein the calibration circuit comprises a divider configured to divide the digital measured magnetic field signal by the digital reference magnetic field signal to generate the calibrated magnetic field signal.
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Abstract
A magnetic field sensor includes at least one magnetic field sensing element configured to generate a measured magnetic field signal responsive to an external magnetic field and to generate a reference magnetic field signal responsive to a reference magnetic field and a calibration circuit configured to divide the measured magnetic field signal by the reference magnetic field signal to generate a calibrated magnetic field signal. The calibrated signal has reduced susceptibility to stress influences.
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Citations
42 Claims
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1. A magnetic field sensor, comprising:
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at least one magnetic field sensing element configured to generate a measured magnetic field signal responsive to and representing an external magnetic field and to generate a reference magnetic field signal responsive to and representing a reference magnetic field; at least one analog-to-digital converter responsive to the measured magnetic field signal to generate a digital measured magnetic field signal and responsive to the reference magnetic field signal to generate a digital reference magnetic field signal; and a calibration circuit responsive to the digital measured magnetic field signal and to the digital reference magnetic field signal to combine the digital measured magnetic field signal and the digital reference magnetic field signal in order to generate a calibrated magnetic field signal that represents the external magnetic field; wherein the calibration circuit comprises a divider configured to divide the digital measured magnetic field signal by the digital reference magnetic field signal to generate the calibrated magnetic field signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A magnetic field sensor, comprising:
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at least one magnetic field sensing element configured to generate a measured magnetic field signal responsive to an external magnetic field and to generate a reference magnetic field signal responsive to a reference magnetic field; and a calibration circuit configured to combine the measured magnetic field signal and the reference magnetic signal by dividing the measured magnetic field signal by the reference magnetic field signal to generate a combined, calibrated magnetic field signal that represents the external magnetic field. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A method for calibrating a sensed magnetic field signal, comprising:
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generating a measured magnetic field signal having an amplitude dependent on an external magnetic field; generating a reference magnetic field signal having an amplitude dependent on a reference magnetic field; converting the measured magnetic field signal into a digital measured magnetic field signal and converting the reference magnetic field signal into a digital reference magnetic field signal; and combining the digital measured magnetic field signal and the digital reference magnetic field signal by dividing the digital measured magnetic field signal by the digital reference magnetic field signal to generate a combined, calibrated signal that represents the external magnetic field. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33)
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34. A method for calibrating a sensed magnetic field signal, comprising:
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generating, by one or more coils, a measured magnetic field signal having an amplitude dependent on an external magnetic field; generating, by the one or more coils, a reference magnetic field signal having an amplitude dependent on a reference magnetic field; and dividing, by a calibration circuit, the measured magnetic field signal by the reference magnetic field signal to generate a combined, calibrated signal that represents the external magnetic field. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41, 42)
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Specification