CIRCUITS AND METHODS FOR GENERATING A THRESHOLD SIGNAL USED IN A MAGNETIC FIELD SENSOR

摘要

A circuit to detect a movement of an object includes a peak sample selection module that uses one or more peak samples (222, 224) from one or more prior cycles (n-1) of a magnetic field signal in order to establish a threshold signal (226) used for comparison in a present cycle (n) of the magnetic field signal to generate a motion signal. Peak samples from prior magnetic field signal cycles may be averaged for use to establish the threshold signal. Methods associated with the circuit are also claimed.