Segmented chopping amplifier

Details Segmented chopping amplifier Segmented chopping amplifier

2006-08-15

2006-08-15

Nguyen, Khanh Van (Department: 2817)

Amplifiers

With periodic switching input-output

Reexamination Certificate

active

07091771

ABSTRACT:
A chopping amplifier and method for chopping an input signal are disclosed. The chopping amplifier and method utilize at least two chopping amplifier stages. A chopping operation of an input signal is segmented across two or more chopping amplifier stages, and the two or more chopping amplifier stages are responsive to a master controller. Chop clock signals of the chopping amplifier stages are staggered so that they have non-overlapping periods and at least one of the chopping amplifier stages is not operating in an open loop at any given time. The non-overlapping periods are periodic so that a master chop clock of the master controller can be operated at a lower chop clock frequency. For every doubling of N number of chopping amplifier stages, magnitudes of chopping artifacts and aliased components are each respectively reduced by 3 dB.

REFERENCES:
patent: 5039989 (1991-08-01), Welland et al.
patent: 6262626 (2001-07-01), Bakker et al.
patent: 6307430 (2001-10-01), Thomsen et al.
patent: 6380801 (2002-04-01), McCartney
patent: 6476671 (2002-11-01), Tang
Enz and Temes, “Circuit Techniques for Reducing the Effects of Op-Amp Imperfections: Autozeroing, Correlated Double Sampling and Chopper Stabilization,” Proc. of the IEEE, 84(11):1584-1614, Nov. 1996.

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