Magnetoresistance type sensor device for detecting change of mag

Details Magnetoresistance type sensor device for detecting change of mag Magnetoresistance type sensor device for detecting change of mag

1995-09-28

1997-04-15

O'Shea, Sandra L.

Electricity: measuring and testing

Magnetic

Magnetometers

338 32R, G01R 3309, H01L 4302

Patent

active

056213204

ABSTRACT:
A magnetoresistance type sensor device for detecting an angle or strength of a magnetic field applied thereto includes first to fourth magnetoresistance elements interconnected so as to constitute a Wheatstone bridge circuit, and a differential amplifier circuit having inputs for receiving a first potential from a first junction formed between a pair of elements and a second potential from a second junction formed between paired elements for thereby generating a differential amplitude voltage signal indicative of the angle or strength of the magnetic field. The magnetoresistance elements are formed of a material having a same composition and dimensioned such that change of the resistance of the first and second magnetoresistance elements brought about by a change in the angle or strength of the applied magnetic field differs from corresponding change of the resistance of the third and fourth magnetoresistance elements, and that the changes of the resistances of the first and second magnetoresistance elements are equal to each other with the changes of resistances of the third and fourth magnetoresistance elements being equal to each other. The temperature characteristics of the magnetoresistance elements are equalized. The differential amplitude voltage signal generated by the differential amplifier is compensated for in respect to the temperature variations.

REFERENCES:
patent: 4596950 (1986-06-01), Lienhard et al.
patent: 4845456 (1989-07-01), Abe et al.
patent: 5055781 (1991-10-01), Sakakibara et al.
patent: 5216363 (1993-06-01), Masaaki
patent: 5500590 (1996-03-01), Pant

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