Continuously calibrated magnetic field sensor

Details Continuously calibrated magnetic field sensor Continuously calibrated magnetic field sensor

2005-09-14

2010-06-29

Aurora, Reena (Department: 2858)

Electricity: measuring and testing

Magnetic

Calibration

C324S260000

Reexamination Certificate

active

07746065

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.

REFERENCES:
patent: 4037150 (1977-07-01), Taranov et al.
patent: 4752733 (1988-06-01), Petr et al.
patent: 100 62 292 (2002-03-01), None
Simon, P.L.C., De Vries, P.H.S., Middelhoek, S., Autocalibration of Silicon Hall Devices, Sensors and Actuators A, Elsevier Sequoia S.A., Lausanne, CH, vol. A52, No. 1/3, Mar. 1, 1996, pp. 203-206, XP000599994, ISN: 0924-4247.
Demierre, M., Pesenti, S., Frounchi, J., Besse, P.A., Popovic, R.S., Reference Magnetic Actuator for Self-Calibration of a Very Small Hall Sensor Array, Sensors and Actuators A, Elsevier Sequoia S.A., Lausanne, CH, vol. 97-98, Apr. 1, 2002, pp. 39-46, XP004361580, ISSN: 0924-4247.

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