Patent ID: 7425870
Filing Date: 2008-09-16
Classification: H03F

Abstract:
1. A current mirror circuit comprising: a first transistor having a first electrode connected to a first potential, a second electrode connected to a second potential lower than the first potential, and a third electrode connected to a third potential higher than the second potential; a second transistor having a first electrode connected to the first potential and the first electrode of the first transistor, a second electrode connected to the second potential, and a third electrode; an operational amplifier having a high-potential input terminal connected to the third potential and the third electrode of the first transistor, and a low-potential input terminal connected to the third electrode of the second transistor; and a third 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 third electrode of the second transistor, and a third electrode used as an output terminal and wherein the first and second transistors are operating in a linear region.