Patent ID: 7755688

Claim:
A photoelectric conversion device comprising: a pixel array in which a plurality of pixels are arrayed in a row direction and a column direction, each pixel including a photoelectric conversion unit and an amplification unit, which outputs a signal corresponding to a charge signal accumulated in the photoelectric conversion unit; a plurality of readout circuits, which read out signals output from pixels for respective columns in the pixel array; and a control unit, which controls the plurality of readout circuits, wherein each of the plurality of readout circuits includes a holding unit, which holds a reference voltage supplied from an external power source, an operational amplification unit, which amplifies the signals from the pixels for each column based on the reference voltage held in the holding unit, and a disconnection unit, which electrically disconnects the holding unit from the external power source, and wherein the control unit controls the disconnection unit to electrically disconnect the holding unit from the external power source when the operational amplification unit amplifies the signals from the pixels for each column.