"AB Cascode" amplifier in an input stage of an amplifier or comp

Details "AB Cascode" amplifier in an input stage of an amplifier or comp "AB Cascode" amplifier in an input stage of an amplifier or comp

1994-08-24

1995-11-28

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330 51, 330261, 330295, 330298, 330311, H03F 345

Patent

active

054711720

ABSTRACT:
An AB Cascode amplifier provides low quiescent current operation, while maintaining the high gain and wide bandwidth of prior art folded cascode amplifier. Instead of fixed current sources, the AB cascode amplifier uses variable current sources, which are biased by a fixed small current source and two variable biased transistor.

REFERENCES:
patent: 4271394 (1981-06-01), Leidich
patent: 5153529 (1992-10-01), Koda et al.
patent: 5337007 (1994-08-01), Barrett, Jr. et al.
Ahuja et al, "A Programmable CMOS Dual Channel Interface Processor for Telecommunications Applications", IEEE Journal of Solid-State Circuits, vol. SC-19, No. 6, Dec. 1984, pp. 892-899.
Excerpt from the book entitled "CMOS Analog Circuit Design" by Phillip E. Allen, Douglas R. Holberg, Saunders College Publishing, pp. 421-426 Copyright 1987.
Article entitled "Design Techniques for Cascoded CMOS Op Amps with Improved PSRR and Common-Mode Input Range" by David B. Ribner and Miles A. Copeland, IEEE Journal, vol. SC-19, No. 6, Dec. 1984.
Article entitled "MOS Operational Amplifier Design--A Tutorial Overview" by Paul R. Gray and Robert G. Meyer, IEEE Journal, vol. SC-17, No. 6, Dec. 1982, pp. 969-982.
Article entitled "High-Frequency CMOS Switched-Capacitor Filters for Communications Application" by Tat C. Choi, etc. IEEE Journal, vol. SC-18, No. 6, Dec. 1983, pp. 652-664.

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