Resetting closed-loop magnetoresistive magnetic sensor

Details Resetting closed-loop magnetoresistive magnetic sensor Resetting closed-loop magnetoresistive magnetic sensor

1992-12-31

1994-09-27

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Magnetometers

33355R, 32420721, 324225, G01R 3306, G01C 1702

Patent

active

053510054

ABSTRACT:
A switched-magnetization closed-loop magnetometer having a magnetoresistive bridge for sensing external magnetic fields. The output signal from the bridge to an amplifier, is magnetically nulled by a feedback coil. Each of the bridge elements have a magnetic easy axis that is periodically and magnetically flipped by a reset coil. The output of the amplifier goes to an analog switch and an integrator in one or the other order. The output of the analog switch or the integrator may go on to a sample and hold circuit, or other sampling device, that alternately samples the output to it in synchronism with the reset coil. The output is processed by a low pass amplifier. A clock provides signals to the reset coil, the analog switch and the sample and hold switch.

REFERENCES:
patent: 4525671 (1985-06-01), Sansom
J. Lenz, "A High-Sensitivity Magnetoresistive Sensor", 1990, in IEEE Doc. No. CH2783-9/90/0000-0114, pp. 114-117.
B. Pant, "Magnetoresistive Sensors", in Scientific Honeyweller, vol. 8, No. 1, Fall 1987, pp. 29-34.
Philips Export B. V., "The magnetoresistive Sensor", 1988, in Philips Technical Publication 268, pp. 14-18.
Honeywell, "Permalloy Magnetic Sensors", Mar. 1991, in technical sensor description having two pages.
Honeywell, "Advanced Integrated Magnetometer (AIM) Technology", 1989, in a technical brochure, having seven pages.

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