Patent ID: 7573415

Claim:
An analog to digital converter circuit, the analog to digital converter circuit comprising: a first comparator, wherein the first comparator receives an input voltage and a first reference voltage; a first storage device, wherein the first storage device is electrically coupled to the first reference voltage; a second comparator, wherein the second comparator receives the input voltage and a second reference voltage; a second storage device, wherein the second storage device is electrically coupled to the second reference voltage; and a reference voltage generation circuit, wherein the reference voltage generation circuit provides the first reference voltage and the second reference voltage, wherein the first reference voltage is provided during a first time period and the second reference voltage is provided during a second time period, and wherein the reference voltage generation circuit includes: a digital to analog converter and a sequencer circuit, wherein the sequencer circuit causes a first digital value corresponding to the first reference voltage to be applied to the digital to analog converter during the first time period, and wherein the sequencer circuit causes a second digital value corresponding to the second reference voltage to be applied to the digital to analog converter during the second time period.