Amplifiers – With semiconductor amplifying device – Including current mirror amplifier
Reexamination Certificate
1998-06-17
2001-02-27
Lee, Benny (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including current mirror amplifier
C330S085000, C323S315000
Reexamination Certificate
active
06194967
ABSTRACT:
BACKGROUND
1. Field
The present invention relates to current mirror circuits and, more particularly, to current mirrors that employ active feedback.
2. Background Information
Current mirrors are well-known circuit configurations. However, advances in the technology have resulted in changes and further improvements in current mirror circuit configurations. One such advance in the technology relates to lower voltages, such as, for example, the development of 1.8 volt semiconductor fabrication processes. In addition, it has become desirable in some circuit applications, such as, for example, circuits, devices, components, and/or systems that comply with the 1394A specification, Draft 2.0, dated Mar. 15, 1998, available from the Institute of Electrical and Electronic Engineers (IEEE), also available via the World Wide Web (WWW), at ftp://ftp.symbios.com/pub/standards/io/1394/P1394a/, (hereinafter “1394A”), to operate over a relatively broad range of voltages or voltage signal levels. Thus, the availability of current mirrors that may operate as accurate current sources in a low voltage environment has become desirable.
SUMMARY
Briefly, in accordance with one embodiment of the invention, an integrated circuit includes an operational amplifier coupled in a circuit configuration. The circuit configuration includes two transistors coupled to the operational amplifier so that the corresponding voltages at the terminals or ports of the transistors are substantially identical.
Briefly, in accordance with one more embodiment of the invention, an integrated circuit includes an operational amplifier coupled in a circuit configuration. The circuit configuration includes two circuit components coupled to the operational amplifier so that the corresponding voltages at the terminals or ports of the circuit components are substantially identical. The circuit components include any circuit component capable of implementing a transconductance.
REFERENCES:
patent: 4064463 (1977-12-01), Leidich
patent: 4412186 (1983-10-01), Nagano
patent: 4605907 (1986-08-01), Rosenthal et al.
patent: 5087891 (1992-02-01), Cytera
patent: 5134310 (1992-07-01), Mobley et al.
patent: 5212458 (1993-05-01), Fitzpatrick et al.
Bult, Klaas and Govert J.G.M. Geelen, “A Fast-Settling CMOS Op Amp for SC Circuits with 90-dB DC Gain”,IEEE Journal of Solid-State Circuits, vol. 25, No. 6, Dec. 1990, pp. 1379-1384.
Gray, Paul R. and Robert G. Meyer,Analysis and Design of Analog Integrated Circuits, published by John Wiely & Sons, 1984, pp. 270-285.
“High-Resolution, Current-Mode A/D Convertors Using Active Current Mirrors”,Electronic Letters, vol. 24, No. 21, Oct. 1988, pp. 1331-1332.
Ahmed Rizwan
Johnson Luke A.
Choe Henry
Intel Corporation
Lee Benny
Seddon Kenneth M.
Skaist Howard A.
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