ANALOG TO DIGITAL CONVERTER, IMAGE SENSOR HAVING THE SAME, AND METHOD OF CONVERTING ANALOG TO DIGITAL

摘要

PURPOSE: An analog to digital converter, an image sensor including the same, and a method of converting analog to digital are provided to prevent the slope mismatch and the offset mismatch between lamp voltages by using one lamp voltage. CONSTITUTION: A reference voltage selection unit(120) outputs a selection reference voltage by selecting one of a plurality of reference voltages based on selection control signals. A multiple input comparison unit(140) generates comparison result signals by comparing a selection reference voltage, a pixel output voltage, a lamp initial voltage, and a lamp voltage. A selection control signal generating unit(160) generates the selection control signal based on the comparison result signals and comparison mode signals. A digital signal generating unit(180) generates digital signals corresponding to the pixel output voltage based on the comparison result signals.