Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
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.
Amini Pezhman
Zadeh Ali E.
Dorsey & Whitney LLP
Micro)n Technology, Inc.
Nguyen Khanh V
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