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US Patent 7746065 Continuously calibrated magnetic field sensor

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Patent
Patent

Patent attributes

Patent Jurisdiction
United States Patent and Trademark Office
United States Patent and Trademark Office
Patent Number
7746065
Date of Patent
June 29, 2010
Patent Application Number
11663136
Date Filed
September 14, 2005
Patent Citations Received
‌
US Patent 12061246 Method and apparatus for magnetic sensor producing a changing magnetic field
3
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US Patent 11680996 Methods and apparatus for magnetic sensor having integrated coil
4
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US Patent 11768256 Coil actuated sensor with sensitivity detection
‌
US Patent 11802922 Circuit for reducing an offset component of a plurality of vertical hall elements arranged in one or more circles
‌
US Patent 11686599 Magnetic field sensor
5
Patent Primary Examiner
Reena Aurora
Reena Aurora
Patent abstract

A magnetic field sensor comprises a reference magnetic field generator (8), a magnetic field sensing cell (6) including Hall effect sensing elements (12), and a signal processing circuit (4) connected to the output (11) of the magnetic field sensing cell and comprising one or more feedback lines (27, 28) for correcting error fluctuations in the transfer characteristic of the magnetic field sensor. The reference magnetic field generator is adapted to generate a frequency modulated reference magnetic field. The signal processing circuit further includes a modulator connected to the magnetic field sensing cell, adapted to modulate the output signal thereof at a frequency different from the modulation frequency of the reference magnetic field generator.

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