Patent ID: 8421889
Filing Date: 2013-04-16
Classification: H03M,H04N

Abstract:
1. An apparatus comprising: a pixel array in which a plurality of pixels for outputting an analog signal are arranged in a matrix; a plurality of vertical output lines each of which is connected to corresponding ones of the plurality of pixels in a same column of the pixel array; a plurality of A/D conversion units, which are individually connected to the plurality of vertical output lines, configured to convert the analog signal into a digital signal; and a constant current supply unit configured to supply a constant current to the plurality of A/D conversion units, and wherein each of the plurality of A/D conversion units includes, an integration unit configured to integrate the constant current, a comparison unit configured to compare the integrated constant current with the analog signal and output a comparison signal, and a digital signal storage unit configured to store a digital signal corresponding to the comparison signal, wherein the integration unit includes an input capacitor configured to receive the constant current from one terminal thereof, wherein the comparison unit is connected to the constant current supply unit via the input capacitor, wherein the constant current supply unit is provided for each A/D conversion unit group composed of corresponding ones of the plurality of A/D conversion units, wherein a Bayer color filter is provided for the plurality of pixels included in the pixel array, and wherein the A/D conversion unit group is provided for corresponding ones of the plurality of pixels on which color filters of the same color are individually placed.