Linear hall circuit for measuring magnetic field strength

Details Linear hall circuit for measuring magnetic field strength Linear hall circuit for measuring magnetic field strength

1993-07-29

1995-06-20

O'Shea, Sandra L.

Electricity: measuring and testing

Magnetic

Magnetometers

324225, 338 32H, 327511, G01R 3306, G01N 2772

Patent

active

054263646

ABSTRACT:
A linear Hall circuit that utilizes a single-ended output Hall current to sense a magnetic field so as to measure the magnetic field strength. A first operational amplifier configured as a transresistance amplifier converts the output Hall current of a Hall device to an output voltage. To avoid inducing a bias-based nonlinearity in the output Hall current, a second operational amplifier, having two resistors connected to both bias electrodes of the Hall device, respectively, is used to inject feedback Hall currents in them. The average value of the bias currents is then kept from varying with the output Hall current of the Hall device.

REFERENCES:
patent: 3416010 (1968-12-01), Kuehnlein et al.
patent: 4449081 (1984-05-01), Doemen
patent: 4646014 (1987-02-01), Eulenberg
patent: 4823075 (1989-04-01), Alley
James Thompson, Magnetic field Measuring Circuit, European Patent Application 0357013, Mar. 1990.
Chinese Patent Application 90106846.2, Jan. 9, 1991.

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