Patent ID: 6914550

Claim:
An analog to digital conversion system, comprising: a plurality of cascaded successive approximation subconverter stages, each subconverter stage receiving a subconverter stage analog input signal and providing a subconverter stage digital output signal representative of the subconverter stage analog input signal, the plurality of successive approximation subconverter stages individually comprising: a switched capacitor system receiving an analog subconverter stage input voltage at a switched capacitor system input node and receiving a thermometer coded intermediate digital signal, the switched capacitor system providing an analog switched capacitor system output signal at a switched capacitor system output node, wherein the switched capacitor system comprises: a plurality of capacitors having substantially equal capacitance values, individual capacitors comprising a first terminal and a second terminal; and a switching system coupled to the second terminals of the plurality of capacitors, the switching system selectively coupling individual capacitors to one of the switched capacitor system input node, the switched capacitor system output node, a first reference voltage, and a second reference voltage according to the thermometer coded intermediate digital signal.