Electricity: measuring and testing – Magnetic – With compensation for test variable
Patent
1986-04-17
1989-05-23
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Magnetic
With compensation for test variable
324252, 338 32H, 307309, G01N 2772, G01R 3302, H01L 4300, A03K 1790
Patent
active
048334065
ABSTRACT:
A temperature compensated Hall-effect sensor apparatus is disclosed which senses the position of a moving body and provides an output signal indicative of the position of the moving body. The apparatus includes a Hall device which senses the application and subsequent removal of a magnetic field and provides an output signal to a constant gain amplifier. Circuitry is provided in the constant gain amplifier for adjusting the gain of the amplifier and also for nulling-out any offset voltage received from the Hall device. The output of the constant gain amplifier is input to a sensitivity compensation and hysteresis circuit for setting a positive-going threshold trip level and a negative-going threshold trip level into a comparator. Circuitry is included which provides both the positive-going and the negative-going threshold trip levels with temperature compensation such that the effective positive and negative trip levels of the comparator remain the same for a given magnetic field and are independent of the temperature of or the signal level out of the Hall device as affected by temperature. Circuitry is provided to change the amount of hysteresis such that the negative-going threshold trip level is a predetermined percentage of the positive-going threshold trip level. The apparatus has a fixed hysteresis ratio.
REFERENCES:
patent: 3671767 (1972-06-01), Davis
patent: 3816766 (1974-06-01), Amselmo et al.
patent: 4371837 (1983-02-01), Sieverin
Eisenzopf Reinhard J.
Household Commercial Financial Services Inc.
Snow Walter E.
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