System and method of detecting movement of an object

Abstract

The present invention relates to a detection system for detecting movements of a movable object (). The system comprises: a light source (S) being adapted for emitting light, a reflecting unit () being arranged in a functional connection with said movable object and being adapted for reflecting said emitted light, an analogue-to-digital converter being adapted for outputting a digital signal and including at least one detector (Dto D; PE, PE) for detecting said reflected light and outputting detection signals for determining the movement of said movable object, current sources being adapted for outputting current signals, and at least one capacitor being adapted for receiving said detection signals and said current signals, a common mode controller being adapted for sensing a voltage on said at least one capacitor and for generating at least one common mode signal for controlling said current sources depending on the sensed voltage, wherein said digital signal indicative of said movement of said movable object being based on said output signal of said at least one detector and said at least one common mode signal. The present invention further refers to a joystick using the detection system, as well as to a method of detecting movements of the movable object.