CMOS opamp with large sinking and sourcing currents and high sle

Details CMOS opamp with large sinking and sourcing currents and high sle CMOS opamp with large sinking and sourcing currents and high sle

1992-12-29

1994-06-28

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330258, H03F 345

Patent

active

053250699

ABSTRACT:
A CMOS opamp having large sinking and sourcing currents, and capable of driving high capacitive loads. The CMOS opamp improves a prior art OPAMP that includes a folded cascode gain stage and a class A/B output stage. By inserting a source follower stage between the folded cascode stage and the output stage, the opamp can drive very large capacitive loads that can also compensate the opamp. By further modifying the output stage, the ability to sink load current is vastly improved.

REFERENCES:
Fisher, John A. "A High-Performance CMOS Power Amp" IEEE J. S.S. Ckts., vol. SC-20 No. 6, Dec. 1985 pp. 1200-1205.
Ribner, David B. et al., "Design Techniques for Cascaded CMOS Op Amps" IEEE J. S.S. Ckts., vol. SC-19 No. 6, Dec. 1984 pp. 919-925.
A Programmable Gain/Loss Circuit by J. Babanezhad and R. Gregorian, IEEE Journal of Solid State Circuits, Dec. 1987, p. 1087, Fig. 7(a).

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