Offset correction for sensor with temperature dependent sensitiv

Details Offset correction for sensor with temperature dependent sensitiv Offset correction for sensor with temperature dependent sensitiv

1986-12-31

1988-03-29

Miller, Stanley D.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307310, 323368, H03K 1790, H03K 343

Patent

active

047345942

ABSTRACT:
A Hall effect device with offset compensation in which the output terminals of a Hall effect element formed in an epitaxial layer are connected to a differential current source. The sum of first and second currents produced by the source is determined by a resistor formed in the epitaxial layer in which the Hall effect element is formed and which is powered by the same electrical source as the Hall effect element so as to produce a current which tracks the current through the Hall effect element with temperature. The current through the resistor is split by a pair of trimmable temperature insensitive resistors and supplied to a pair of cross-coupled current mirrors which supply the currents to the output terminals of the Hall effect element.

REFERENCES:
patent: 3671767 (1972-06-01), Davis
patent: 4371837 (1983-02-01), Sieverin
patent: 4521727 (1985-06-01), Atherton et al.
Hall Cell Bias and Offset Circuit", J. E. Gersbach, IBM Tech. Disclosure Bulletin, vol. 20, No. 6, 1977, pp. 2149 and 2150.

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