Patent ID: 9726519
Date: 2017-08-08
CPC Classifications: F02P,G01B,G01D

Claim:
1. A variable reluctance sensor interface for processing a variable reluctance sensor signal that reflects a magnetic flux variation that occurs when a tooth passes by a variable reluctance sensor, wherein the tooth has a leading tooth edge and a trailing tooth edge, the variable reluctance sensor interface comprising: a leading edge comparator including a first input configured to receive the variable reluctance sensor signal and including an output configured to provide a leading edge signal in response to the variable reluctance sensor signal reaching a first threshold value; a trailing edge comparator including a first input configured to receive the variable reluctance sensor signal and including an output configured to provide a trailing edge signal in response to the variable reluctance sensor signal decreasing to reach a second threshold value; a post-processing circuit configured to receive the leading edge signal and the trailing edge signal and generate a pulse in a detect signal having a width corresponding to a difference between the leading edge signal and the trailing edge signal; and a clearing signal generator configured to generate a clearing signal at a time corresponding to a noise event, the clearing signal generator coupled to the post-processing circuit and configured to clear the post-processing circuit in response to the clearing signal.