Patent ID: 7834616
Filing Date: 2010-11-16
Classification: G01D,G01P

Abstract:
1. A movement sensing system comprising: a multi-pole magnet; a semiconductor substrate; a first magnetic sensor formed on the semiconductor substrate, wherein the first magnetic sensor produces a first output signal in response to movement of the multi-pole magnet; a second magnetic sensor formed on the semiconductor substrate so as to be intertwined with the first magnetic sensor and so as to be at a predetermined angle with respect to the first magnetic sensor, wherein the second magnetic sensor produces a second output signal in response to movement of the multi-pole magnet, wherein the predetermined angle is between 0° and 180° exclusive, and wherein the predetermined angle is sufficient to produce a difference in phase between the first and second output signals; and, an output signal converter arranged to convert the first and second output signals to a linear signal, wherein the output signal converter is arranged to: determine a first difference between the first output signal and a reference; determine a second difference between the second output signal and the reference; and, divide one of the first and second differences by the other of the first and second differences to produce a division result.