Electronic device

An electronic device for use in a touch-based user interface, the electronic device comprising a set of first capacitors, a second capacitor, a third capacitor, and an analog-to-digital converter, wherein:

• the set of first capacitors and the second capacitor each have a first terminal that are coupled to each other through a set of first switches;
• the first terminal of each capacitor of the set of first capacitors is coupled to an input of the analog-to-digital converter through a first switch of the set of first switches, the first terminal of each of the first capacitors is coupled to a voltage input terminal through a second switch, a second terminal of each of the first capacitors is coupled to the voltage input terminal through a third switch, and the second terminal of each of the first capacitors is coupled to a voltage reference terminal through a fourth switch, and wherein the set of first capacitors are sensing capacitors and each capacitor of the set of first capacitors corresponds to a position in an array of sensing elements which represent a multi-channel touch sensor;
• the first terminal of the second capacitor is coupled to the input of the analog-to-digital converter, and a second terminal of the second capacitor is coupled to the voltage reference terminal;
• a first terminal of the third capacitor is coupled to the first terminal of each of the first capacitor, and a second terminal of the third capacitor is coupled to the voltage reference terminal;
• the third capacitor is coupled to the second capacitor through the first switch;
• the third capacitor is coupled to the input of the analog-to-digital converter through the first switch.