Patent ID: 8279097

Claim:
A method of operating an analog-to-digital converter (ADC), the method comprising: providing the ADC comprising: a plurality of stages, each comprising: an operational amplifier: a first capacitor comprising a first input end; and a second capacitor comprising a second input end, wherein each of the first capacitor and the second capacitor comprises an additional end connected to a same input of the operational amplifier; performing a plurality of signal conversions, wherein each of the plurality of signal conversions comprises: in an amplifying phase of one of the plurality of stages, applying a first voltage to the first input end of the one of the plurality of stages; in the amplifying phase, randomly selecting a second voltage from two different voltages; and applying the second voltage to the second input end of the one of the plurality of stages; and accumulating digital output codes of the one of the plurality of stages to generate an accumulated value, wherein the digital output codes are generated in the plurality of signal conversions.