Signal conditioning circuit for magnetic sensing means

Details Signal conditioning circuit for magnetic sensing means Signal conditioning circuit for magnetic sensing means

H - Electricity

03

K

328/166, 340/124

H03K 5/08 (2006.01) F02P 7/067 (2006.01) F02P 17/04 (2006.01) G01P 3/48 (2006.01) H03K 5/1536 (2006.01)

Patent

CA 1115375

SIGNAL CONDITIONING CIRCUIT FOR MAGNETIC SENSING MEANS ABSTRACT OF THE DISCLOSURE A signal conditioning circuit for the output of a magnetic position sensor is disclosed. The magnetic sensor generates a total output signal that increases as a function of the rotational velocity of the sensor with a spurious noise component that is a relatively constant percentage of the actual signal voltage over the speed range. In a preferred embodiment, the signal conditioning circuit discriminates between the noise component and the signal component by com- paring the total signal to a variable threshold only after a positive going zero cross. The variable threshold is generated as a function of the peak amplitude of the total signal. In a second embodiment the signal conditioning circuit includes gain control means which varies the amplitude of the total input signal as a function of its peak to maintain the thres- hold above the noise component.

306073

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