Class AB folded-cascode amplifier having cascode compensation

Details Class AB folded-cascode amplifier having cascode compensation Class AB folded-cascode amplifier having cascode compensation

2006-07-27

2008-08-19

Pascal, Robert (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S257000

Reexamination Certificate

active

07414473

ABSTRACT:
A class AB folded-cascode amplifier having improved gain-bandwidth product, comprises a differential input circuit including a differential transistor pair coupled to a source of tail current and responsive to a differential input signal for conducting a first current, a cascode circuit coupled to the differential input circuit for supplying a second current thereto, and a class AB output stage. A compensation circuit is configured for feeding back mutually complementary compensation signals from an output node to the differential input circuit.

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Bhupendra K. Ahuja, “An Improved Frequency Compensation Technique for CMOS Operational Amplifiers,” IEEE Journal of Solid-State Circuits, Dec. 1983, pp. 629-633, vol. SC-18, No. 6.
David B. Ribner and Miles A. Copeland, “Design Techniques for Cascoded CMOS Op Amps with Improved PSRR and Common-Mode Input Range,” IEEE Journal of Solid-State Circuits, Dec. 1984, pp. 919-925, vol. SC-19, No. 6.
Paul J. Hurst, et al., “Miller Compensation Using Current Buffers in Fully Differential CMOS Two-Stage Operational Amplifiers,” IEEE Transactions on Circuits and Systems—I: Regulator Papers, Feb. 2004, pp. 275-285, vol. 51, No. 2.
Libin Yao, et al., “Fast-Settling CMOS Two-Stage Operational Transconductance Amplifiers and Their Systematic Design,” IEEE International Symposium on Circuits and Systems, 2002, pp. II-839-II-842, IEEE.

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