Current output circuit

A current output circuit comprising:

• a first field-effect transistor (FET), wherein a power supply voltage is supplied to a source of the first FET, a first voltage is supplied to a gate of the first FET, and a first current is output from a drain of the first FET;
• a second FET, wherein the power supply voltage is supplied to a source of the second FET, the first voltage is supplied to a gate of the second FET, and an output current is output from a drain of the second FET;
• a first control circuit that controls the first voltage such that the first current is at a target level;
• and
• a second control circuit that makes a drain voltage of the first FET equal to a drain voltage of the second FET,
• wherein the first control circuit includes a first operational amplifier that controls the first voltage such that the first current is at the target level based on a reference voltage corresponding to the target level and a second voltage corresponding to the first current,
• wherein the second control circuit includes:
• a sixth FET, wherein a drain of the sixth FET and a gate of the sixth FET are connected to each other and a third current is output from the drain of the sixth FET, and
• a seventh FET, wherein a gate of the seventh FET is connected to the gate of the sixth FET and the seventh FET has the same current density as the sixth FET,
• wherein a source of the sixth FET is connected to the drain of the second FET, and
• wherein a source of the seventh FET is connected to the drain of the first FET.