Imaging apparatus, method of driving imaging apparatus, and apparatus using the imaging apparatus

An imaging apparatus, comprising:

• a plurality of pixels each including a photoelectric conversion element and an input transistor configured to receive a signal corresponding to electric charges generated by the photoelectric conversion element;
• an output line connected to the plurality of pixels;
• and
• a current source unit including:
• a current source;
• a first transistor having a first control node, a first main node connected to a common node, and a second main node supplied with a predetermined voltage, the common node being a node connected to the current source and the first control node;
• a second transistor having a second control node connected to the common node, a third main node connected to the output line, and a fourth main node supplied with a predetermined voltage;
• and
• a capacitor having a first node connected to the common node, and a second node supplied with a first voltage and a second voltage different from the first voltage,
• wherein the current source unit is configured to supply a bias current having a first current value by supplying the first voltage to the second node, and the bias current having a second current value different from the first current value by supplying the second voltage to the second node.