Patent ID: 8106803

Claim:
A digital-to-analog converter comprising: a plurality of capacitors; one or more voltage sources configured for recharging the plurality of capacitors; a plurality of recharge switches disposed between the one or more voltage sources and the plurality of capacitors, each of the plurality of recharge switches being configured to control recharging of one of the plurality of capacitors, respectively; a plurality of discharge switches each respectively configured to discharge one of the plurality of capacitors to produce a differential analog output; and a control circuit configured to select which of the plurality of capacitors to charge and discharge using one or more of the plurality of discharge switches or one or more of the plurality of recharge switches, the selection being based on the value of a digital input and the analog output including a pulse of charge representative of the digital input, wherein members of the plurality of capacitors are disposed in different unit cells configured to be operated in series such that one member of the plurality of capacitors is charged while another member of the plurality of capacitors is being discharged.