Low-noise, low-power, low drift offset correction in...

Details Low-noise, low-power, low drift offset correction in... Low-noise, low-power, low drift offset correction in...

2011-07-05

2011-07-05

Pascal, Robert (Department: 2817)

Amplifiers

With periodic switching input-output

C330S051000

Reexamination Certificate

active

07973596

ABSTRACT:
Low-noise, low-power, low drift offset correction in operational and instrumentation amplifiers and amplifiers using the same are disclosed. The amplifiers disclosed use different combinations of chopping and auto-zero techniques. Also disclosed are amplifiers using on-off switches to affect the chopping and auto-zeroing, with unique circuits for driving the switches on the differential input to provide boot-strapped switch controls. Other features are disclosed.

REFERENCES:
patent: 6734723 (2004-05-01), Huijsing et al.
Dessouky, Mohamed , et al., “Very Low-Voltage Digital-AudioΔΣ Modulator with 88-dB Dynamic Range Using Local Switch Bootstrapping”,IEEE Journal of Solid-State Circuits, vol. 36, No. 3, (Mar. 2001), pp. 349-355.
Enz, Christian C., et al., “Circuit Techniques for Reducing the Effects of Op-Amp Imperfections: Autozeroing, Correlated Double Sampling, and Chopper Stabilization”,Proceedings of the IEEE, vol. 84, No. 11, (Nov. 1996), pp. 1584-1614.
Eschauzier, Rudy G., et al., “Frequency Compensation Techniques for Low-Power Operational Amplifiers”, Section 6.1, Springer, (1995).
Eschauzier, Rudy G., et al., “Frequency Compensation Techniques for Low-Power Operational Amplifiers”, Section 6.3, Springer, (1995).
Huijsing, Johan H., “Operational Amplifiers, Theory and Design”, Kluwer Academic Publishers, (2001), pp. 52-53.
Weste, Neil H., et al., “Principles of CMOS VLSI Design, A Systems Perspective, Second Edition”, Section 5.5.10, Addison-Wesley Publishing Company, (1993), pp. 346-350.

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