Amplifiers – With semiconductor amplifying device – Including push-pull amplifier
Patent
1993-04-02
1994-09-27
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including push-pull amplifier
330265, 330267, H03F 330
Patent
active
053510127
ABSTRACT:
A current feedback operational amplifier input stage is provided that uses a pair of dual output current mirrors to couple current from the inverting input of the amplifier to the high gain node of the amplifier, and to reduce the input impedance of the inverting input by means of local current feedback. Each of the dual output current mirrors employs an emitter degenerated Wilson-type current mirror in conjunction with an emitter degenerated transistor current source to detect signal current at the inverting input and use this current to control the bias current at both the inverting input and the high impedance node of the amplifier. The ratio of bias currents in the dual output current mirrors are controlled by scaling the resistances of the emitter degeneration resistors corresponding to each current node.
REFERENCES:
patent: 5103188 (1992-04-01), Benden
patent: 5179355 (1993-01-01), Harvey
D. C. Wadsworth, "Accurate Current Conveyor Topology and Monolithic Implementation", IEE Proceedings, Apr. 1990, Part G, vol. 137, No. 2, pp. 88-94.
I. A. Koullias, "A Wideband Low-Offset Current-Feedback Op Amp Design"; Proceedings of the 1989 Bipolar Circuits and Technology Meeting, Minneapolis, Minn., Sep. 18-19, 1989, pp. 120-123.
A. Payne and C. Toumazou, "High Frequency Self-Compensation of Current-Feedback Devices", 1992 IEEE International Symposium Circuits and Systems, San Diego, Calif., May 10-13, 1992, pp. 1376-1379.
Elantec, Inc.
Mullins James B.
Novakoski Leo V.
Smith Albert C.
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