Photoelectric-conversion device, focus detection apparatus, and image-pickup system

摘要

A photoelectric-conversion device that allows for both of widening the dynamic range and performing an operation to monitor the amount of received light is achieved. A sensor-cell unit (101) that can operate in low-sensitivity mode and high-sensitivity mode, a transfer unit (201) transferring a signal output from a unit pixel, and a monitoring unit monitoring a signal transmitted from the sensor-cell unit, the signal being output from the transfer unit, are provided.