Patent ID: 8754360

Claim:
Detection system for detecting movements of a movable object, said system comprising: a light source adapted for emitting light, a reflecting unit arranged in a functional connection with said movable object and adapted for reflecting said emitted light, an analogue-to-digital converter adapted for outputting a digital signal and including at least one detector for detecting said reflected light and outputting detection signals for determining a movement of said movable object, a plurality of current sources adapted for outputting current signals, and at least one capacitor adapted for receiving said detection signals and said current signals, and a common mode controller 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 is based on said output signal of said at least one detector and said at least one common mode signal.