Patent ID: 7622993

Claim:
A current mirror circuit comprising: a first resistance element having one terminal connected to a first potential and the other terminal connected to a second potential lower than the first potential; an operational amplifier having a high-potential input terminal connected to the first potential and the one terminal of the first resistance element; a second resistance element having one terminal connected to a low-potential input terminal of the operational amplifier and the other terminal connected to the second potential; and a transistor having a first electrode connected to an output terminal of the operational amplifier, a second electrode connected to the low-potential input terminal of the operational amplifier and the one terminal of the second resistance element, and a third electrode used as an output terminal; wherein a potential of a connection node of the high-potential input terminal of the operational amplifier with said one terminal of the first resistance element is set to a value equal to a potential of a connection node of the low-potential input terminal of the operational amplifier with said one terminal of the second resistance element and the second electrode of the transistor; wherein the first resistance element and the second resistance element both start to operate from a linear area having lower voltage than a saturation area.