Apparatus for detecting the speed of a rotating element includin

Electricity: measuring and testing – Electrical speed measuring – Including speed-related frequency generator

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324173, 324174, 32420721, 324252, 327175, 327510, G01P 3481, G01P 3489, G01P 3309, H03K 3017

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active

057449503

ABSTRACT:
A sensor for determining the rotational speed of a rotating element. The sensor includes a giant magnetoresistive ratio sensing device which is magnetically coupled to the rotating element and includes an output terminal. The sensing device generates an output signal at the output terminal having a frequency corresponding to the rotational speed of the rotating element. A wave-shaping circuit is connected to the output terminal for receiving the output signal and for generating a digital switching signal having a frequency equal to the frequency of the output signal. A frequency divider has an input connected to the wave shaping circuit for receiving the digital switching signal. The frequency divider generates, in response to the digital switching signal, a square wave output having a 50% duty cycle and a frequency equal to the frequency of the digital switching signal divided by a predetermined divisor.

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