Switched-capacitor amplifier with improved reset phase

Details Switched-capacitor amplifier with improved reset phase Switched-capacitor amplifier with improved reset phase

2007-11-16

2009-12-29

Choe, Henry K (Department: 2817)

Amplifiers

With periodic switching input-output

C330S069000

Reexamination Certificate

active

07639073

ABSTRACT:
A switch-capacitor (“SC”) amplifier includes a two-stage operational amplifier (“OP-AMP”), an input SC network, and a feedback SC network. The two-stage OP-AMP includes a first OP-AMP stage having an output coupled to an input of a second OP-AMP stage. The input SC network is coupled to an input of the first OP-AMP stage. The feedback SC network is configured to selectively couple the output of the first OP-AMP stage to the input of the first OP-AMP stage during a first phase of operation of the SC amplifier and to couple an output of the second OP-AMP stage to the input of the first OP-AMP stage during a second phase of operation of the SC amplifier.

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C.C. Enz and G.C. Temes, “Circuit Techniques for Reducing the effect of Op-Amp Imperfections: Autozeroing, Correlated Double Sampling, and Chopper Stabilization,” Proceedings of the IEEE, vol. 84, No. 11, pp. 1584-1614, Nov. 1996.
PCT/US2008/082532 International Search Report and Written Opinion of the International Searching Authority, mailed Feb. 19, 2009, 9 pages.

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