Patent ID: 7015832
Filing Date: 2006-03-21
Classification: G01D

Abstract:
1. A digital incremental encoder for generating output signals indicative of an angular position, a direction of rotation, and a speed of rotation of a shaft, comprising: a counter for receiving a PWM signal indicative of the angular position of the shaft and a clock signal from an angular position sensor, and for generating a multi-bit output; and a latch for latching the multi-bit output, wherein the output signals are generated using a first bit and a second bit of the latched multi-bit output, the output signals comprising the first bit, wherein the first bit and an XOR output generated from the first bit and the second bit have a quadrature phase relationship, the output signals further comprising the XOR output, and wherein the direction of rotation of the shaft can be derived from the quadrature phase relationship between the first bit and the XOR output.