Solid-state imaging apparatus and imaging system

A solid-state imaging apparatus, comprising:

• a plurality of pixels constituting a pixel array including a plurality of pixel columns;
• and
• a plurality of amplifier units arranged respectively corresponding to the plurality of pixel columns of the pixel array, and configured to amplify a signal from corresponding one of the plurality of pixel columns,
• the plurality of amplifier units comprising:
• an amplifier having a first input terminal, a second input terminal, and an output terminal;
• an input capacitor having one terminal to which an output signal from corresponding one of the plurality of pixels is input, and another terminal connected to the second input terminal of the amplifier;
• a feedback switch connected between the second input terminal and the output terminal of the amplifier;
• and
• a feedback capacitor connected in parallel with the feedback switch and between the second input terminal and the output terminal of the amplifier,
• wherein a driving current of the amplifier during a first period is smaller than a driving current of the amplifier during a second period in which the amplifier amplifies the output signal from the corresponding one of the plurality of pixels, and
• wherein the feedback switch is set to a connection state during the first period.