Apparatus and method for a low-voltage class AB amplifier...

Details Apparatus and method for a low-voltage class AB amplifier... Apparatus and method for a low-voltage class AB amplifier...

2007-01-16

2007-01-16

Nguyen, Patricia (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S265000, C330S267000

Reexamination Certificate

active

11003299

ABSTRACT:
An op amp is arranged for low-voltage, rail-to-rail operation with a class AB output. The op amp includes a transconductance input stage, a folded cascode middle stage that includes a split cascode, a high-side driver, a low-side driver, a sampling circuit, and a split-cascode bias circuit. The split cascode includes two cascode transistors with their sources coupled to each other. Also, the sampling circuit that is arranged to sample the high-side driver current and the low-side sample current. The split cascode bias current is arranged to compare the sample current with a reference current, and to provide bias voltages to the gates of the two cascode transistors in the split cascode.

REFERENCES:
patent: 5442320 (1995-08-01), Kunst et al.
patent: 5598129 (1997-01-01), Chambers
patent: 6154092 (2000-11-01), Lee et al.
patent: 6781463 (2004-08-01), Burt
patent: 6828855 (2004-12-01), Wang
M. Jeroen Fonderie and Johan H. Huijsing, “Design of Low-Voltage Bipolar Operational Amplifiers”, Kluwer Academic Publishers, pp. 78-89.
Fan You et al., Low-Voltage Class AB Buffers with Quiescent Current Control, IEEE Journal of Solid-State Circuits, vol. 33, No. 6, Jun. 1998, pp. 915-920.

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