Photoelectric conversion device and imaging system

A photoelectric conversion device comprising:

• a plurality of pixels arranged to form a plurality of rows and a plurality of columns and each including a photoelectric converter;
• an amplifier unit configured to amplify, at a plurality of gains, a signal in accordance with an amount of charge generated by the photoelectric converter of each of the pixels;
• a plurality of signal holding capacitors provided in association with the plurality of columns and each configured to hold the signal amplified by the amplifier unit;
• a plurality of switches provided in association with the plurality of columns and each configured to control a sample-and-hold operation of the signal to each of the signal holding capacitors on a corresponding column;
• and
• a control unit that supplies a control signal that controls operations of the plurality of switches,
• wherein the control unit
• supplies the control signal whose settling time when the plurality of switches transition from an on-state to an off-state is a first length when the signal amplified by the amplifier unit at a first gain is held in each of the signal holding capacitors, and
• supplies the control signal whose settling time when the plurality of switches transition from an on-state to an off-state is a second length, which is shorter than the first length, when the signal amplified by the amplifier unit at a second gain, which is higher than the first gain, is held in each of the signal holding capacitors.