Solid-state image pickup device and signal processing method therefor

A solid-state image pickup device comprising:

• a pixel array part in which a plurality of pixels each including a photoelectric conversion element are arrayed in a one-dimensional direction or in two-dimensional directions;
• and signal processing parts for performing predetermined signal processing on pixel signals outputted from the pixels, each of the signal processing parts having an A/D converter for converting an analog signal into a digital signal, the A/D converter including at least a modulator,
• wherein the modulator is a .DELTA..SIGMA. modulator, and the A/D converter further includes a digital filter, further comprising an output control part for sequentially selecting and outputting digital image signals converted by a plurality of A/D converters, wherein the output control part includes latches, and wherein a source voltage for the digital filter, and the latches is made lower than the pixel array part.