Amplifiers – Signal feedback – In cascade amplifiers
Reexamination Certificate
2011-05-24
2011-05-24
Mottola, Steven J (Department: 2817)
Amplifiers
Signal feedback
In cascade amplifiers
C330S107000
Reexamination Certificate
active
07948309
ABSTRACT:
An amplifier circuit includes a transconductance amplifier at an input side of the amplifier circuit, a transimpedance amplifier connected to an output of the transconductance amplifier, and a voltage amplifier connected to an output of the transimpedance amplifier. The transconductance amplifier and the transimpedance amplifier form a low-impedance node at an interface thereof. A feedback circuit is connected between an output of the voltage amplifier and the low-impedance node between the transconductance amplifier and the transimpedance amplifier. The transconductance amplifier, the transimpedance amplifier, and the voltage amplifier form a main amplifier stage. The feedback circuit senses an imbalance in an output of the main amplifier stage, whereby a correction signal is integrated and negatively fed back to the low-impedance node between the transconductance amplifier and the transimpedance amplifier.
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patent: 7355471 (2008-04-01), Chen et al.
patent: 7652531 (2010-01-01), Wang et al.
patent: 2007/0066254 (2007-03-01), Tsuchie et al.
Mak Pui-In
Martins Rui P.
U Seng-Pan
Mottola Steven J
Osha • Liang LLP
University of Macau
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