Digital to analog converter

A method for generating a sequence of one or more voltage ramps, the method comprising:

• controlling, by a controller, a plurality of first switches of a digital-to-analog converter,
• wherein the digital-to-analog converter comprises:
• a plurality of first capacitors, each having a first electrode and a second electrode,
• wherein the second electrodes are connected together and are connected to an inverting input of a first amplifier stage having its non-inverting input coupled to ground,
• wherein each of the first capacitors has its first electrode connected to a corresponding one of the first switches, and
• wherein each of the first switches is capable of occupying a first state where the first electrode of a corresponding first capacitor is coupled to a first reference voltage, and occupying a second state where the first electrode of the corresponding first capacitor is coupled to a second reference voltage different from the first reference voltage, and
• a capacitive feedback circuit comprising at least one second capacitor connected between the inverting input and an output of the first amplifier stage, and
• wherein the first switches are controlled in order to modify a charge accumulated in the capacitive feedback circuit and therefore in order to generate the sequence at the output of the first amplifier stage of the digital-to-analog converter.