Image sensor and image-capturing device with electric current source units each including a storage unit, a supply unit, and an adjustment unit

An image sensor, comprising:

• a plurality of electric current source circuits, each electric current source circuit including:
• (i) a first storage unit, which stores a voltage based on an electric current from a reference electric current source circuit;
• (ii) a supply unit that supplies an electric current being generated by the voltage stored in the first storage unit, the supply unit including a transistor having a gate terminal connected to the first storage unit, and the first storage unit including a capacitor having a terminal connected to the gate terminal and a terminal connected to a ground;
• and
• (iii) an adjustment unit that adjusts an electric current supplied from the reference electric current source circuit to the first storage unit;
• and
• a plurality of pixel circuits, each pixel circuit including (i) a pixel having a photoelectric conversion unit that converts light into an electric charge and a readout circuit for reading out a signal based on the electric charge resulting from a photoelectric conversion in the photoelectric conversion unit, (ii) a second storage unit that stores a voltage based on an electric current from the supply unit, and (iii) an electric current source that supplies the pixel with an electric current generated by the voltage stored in the second storage unit.