Analogue to digital converter, an integrated circuit and medical device

An analogue-to-digital converter for converting an analogue input signal into a digital output signal, the analogue-to-digital converter comprising:

• a first input connection configured to receive a first part of the analog input signal;
• a second input connection configured to receive a second part of the analogue input signal;
• a first plurality of capacitors and a second plurality of capacitors, each capacitor of the first and second plurality of capacitors having a first contact and a second contact, each capacitor of the first plurality of capacitors having a corresponding capacitor in the second plurality of capacitors to form a plurality of capacitor pairs;
• a switching array coupled to the second contact of each capacitor in the first and second plurality of capacitors;
• and,
• switching logic for controlling the switching array;
• wherein, during a sampling period of the analogue-to-digital converter, the first input connection is configured to couple the first part of the analogue input signal to the first contact of each capacitor of the first plurality of capacitors, the second input connection is configured to couple the second part of the analogue input signal to the first contact of each capacitor of the second plurality of capacitors, and the switching logic is configured to cause the switching array to couple the second contact of each capacitor of the first and second plurality of capacitors to a common mode voltage to determine a first bit of the digital output signal.