Patent ID: 8223056

Claim:
A cyclic digital to analog converter comprising: an amplifier including a first input node, a second input node, and an output node; a capacitor network including a first capacitor and a second capacitor coupled to the amplifier; three fixed reference voltages coupled to a voltage input node coupled to the capacitor network; and a control circuit comprising an input, the control circuit being configured to receive via the input a digital input code comprising a plurality of bits, the digital input code specifying an output voltage; and switching circuitry coupled to the control circuit, the control circuit configured to control the switching circuitry to generate the output voltage on the output node of the amplifier after a plurality of cycles, each cycle corresponding to one of the plurality of bits of the digital input code, the control circuit configured to control the switching circuitry to, for each cycle of the plurality of cycles, apply, via the voltage input node, a selected reference voltage selected from among the three fixed reference voltages, and wherein the control circuit is configured to control the switching circuitry to, for each cycle of the plurality of cycles, couple the first capacitor in parallel with the second capacitor between an input node of the amplifier and the output node of the amplifier.