A CMOS MOTION DETECTOR SYSTEM FOR POINTING DEVICES

A motion detector system uses an array of 93 photodiodes integrated al ong with processing circuits to detect the motion of a printed random pattern on a bail used in a pointing de,ice application, It is based o n tile detection and tracking of spot edges passing over a matrix of p ixels during the period between two light pulses. Motion in x and y di rections is estimated bg aggregating local information about moving ed ges over the photosensitive pixels. The 4.4 x 4.3 mm(2) chip detects t he hall motion from 0 to 11.8 in/s with a resolution higher than 800 d pi over a 100-2000 mW/m(2) light-intensity range.