Hall sensor with high pass hall voltage filter

Details Hall sensor with high pass hall voltage filter Hall sensor with high pass hall voltage filter

1989-06-29

1991-01-01

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Displacement

324251, 324174, 333172, G01R 3306, H01L 4306

Patent

active

049821555

ABSTRACT:
A Hall sensor has at least one Hall element connected to the input of a differential high pass filter which includes a series branch circuit made up of two outer resistors and a central capacitor connected between the two resistors, a first summing circuit with inputs connected across the capacitor plus one of the branch resistors, a second summing circuit connected across the capacitor plus the other of the branch resistors, and a subtraction circuit having the input connected to the outputs of said first and second summing circuits. The subtraction circuit may be a differential amplifier or a differential comparator such as a differential Schmitt trigger circuit. This sensor is particularly advantageous in an electrically noisy environment, for example in use as a combustion-engine-vehicle gear tooth counting sensor, where the high common mode rejection feature of this Hall sensor reduces the chances for false counting.

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IBM Technical Disclosure Bulletin, "Differential Second-Order Lowpass Filter", vol. 27, No. 11, Apr. 1985, pp. 6484-6485.

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