Amplifiers – With semiconductor amplifying device – Including current mirror amplifier
Reexamination Certificate
2008-08-08
2009-11-24
Choe, Henry K (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including current mirror amplifier
C323S315000
Reexamination Certificate
active
07622993
ABSTRACT:
A current mirror circuit including: 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 the first and second resistance elements both start to operate from a linear area having lower voltage than a saturation area.
REFERENCES:
patent: 5986507 (1999-11-01), Itakura et al.
patent: 6064267 (2000-05-01), Lewyn
patent: 6194967 (2001-02-01), Johnson et al.
patent: 6587000 (2003-07-01), Oikawa
patent: 11-214934 (1999-08-01), None
patent: 2000-114891 (2000-04-01), None
Charlon, O., and W. Redman-White, “Ultra High-Compliance CMOS Current Mirrors for Low Voltage Charge Pumps and References,” Proceedings of the 30th European Solid-State Circuits Conference, Leuven, Belgium, Sep. 21-23, pp. 227-230.
Kobayashi Haruo
Mashiko Koichiro
Niki Yoshiki
Choe Henry K
Christensen O'Connor Johnson & Kindness PLLC
Semiconductor Technology Academic Research Center
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