Patent ID: 8917098

Claim:
A converter circuit comprising: an input unit receiving a conversion target signal from a pixel of an image sensor; a detection unit receiving a conversion target signal for each of a plurality of converter circuit switching intervals from the input unit, sequentially sampling the conversion target signal for each switching interval according to a plurality of timings to obtain a corresponding plurality of samples, calculating an average value of the conversion target signal for each interval by averaging the plurality of samples, and outputting a comparison unit input signal corresponding to the average value of the conversion target signal for each switching interval; and a comparison unit comparing the comparison unit input signal with a predetermined reference signal to output a comparison result value; wherein the detection unit comprises of plurality of charge storage units detecting the conversion target signal for each switching interval; and wherein each of the charge storage units comprises a plurality of charge storage devices and a plurality of switching devices and samples the conversion target signal for each switching interval by sequentially operating the plurality of charge storage devices according to the plurality of timings.