HIGH-RESOLUTION AND HIGH-SPEED TWO-STEP SINGLE-SLOPE COMPARATOR AND CMOS IMAGE SENSOR THEREBY

摘要

The present technology relates to a comparator and a complementary metal oxide semiconductor (CMOS) image sensor thereby. Specifically, the present invention provides a comparator to be used for the analog-digital conversion by accumulating a difference value between a pixel signal and a coarse step voltage in multi-sampling; and a CMOS image sensor thereby. The comparator comprises: a first-stage comparison block for accumulating a difference value between a pixel signal and a coarse step voltage and outputting a difference between the accumulated value and a coarse ramping voltage as a residue voltage; and a second-stage comparison block for comparing a fine ramping voltage with the residue voltage from the first-stage comparison block to output a third comparison signal.;COPYRIGHT KIPO 2019