Class AB amplifier and imagers and systems using same

Details Class AB amplifier and imagers and systems using same Class AB amplifier and imagers and systems using same

2007-05-04

2010-06-29

Nguyen, Khanh V (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S255000

Reexamination Certificate

active

07746170

ABSTRACT:
A class AB amplifier includes an input stage having a pair of differential input terminals, first and second differential output terminals, and a local common mode feedback circuit. The input stage includes a local common mode feedback circuit having cascode transistor to achieve relatively high gain. The amplifier also includes an output stage having first and second pairs complementary transistors coupled between first and second power supply nodes. One of the complementary transistors in each pair has a gate coupled to the first and second differential output terminals, respectively. The output stage includes a pair of cascode transistor connected to one of the pairs of complementary output transistors. The amplifier can be used to supply a bias voltage to a highly capacitive load, such as voltage sampling capacitors in a CMOS imager.

REFERENCES:
patent: 6346856 (2002-02-01), Myers et al.
patent: 7119616 (2006-10-01), Benzer
Ramesh Jarjani, “An Integrated Low-Voltage Class AB CMOS OTA”; IEEE Journal of Solid State Circuits, vol. 34, No. 2, Feb. 1999; pp. 134-142.
Antonio J. Lopez-Martin, “An Integrated Low-Voltage Class AB CMOS OTA”; IEEE Journal of Solid State Circuits, vol. 40, No. 5, May 2005; pp. 1068-1077.

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