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A novel continuous-time common-mode feedback for low-voltage switched-OPAMP

Published: 09 August 2004 Publication History

Abstract

A novel rail-to-rail and fast continuous-time common-mode feedback (CMFB) strategy is presented proper for low-voltage Switched-OPAMP (SO) circuits. The threshold voltage change due to bulk signal is used to measure the output voltage. To satisfy speed requirements, averaging common-mode (CM) level and amplifying error signal are realized in a single block. Finally, the measured CM level is controlled by applying an error-voltage dependent current to the output nodes. As a design example, a modified low-voltage switched-OPAMP in a cascade 2-1 delta-sigma modulator adopting the proposed technique is presented. SPICE simulation using a 0.18µm technology and VDD=0.9V is provided which confirms the expected accuracy and speed of the CMFB circuitry.

References

[1]
Dorf, R.C., Bishop, R.H., Modern Control Systems, Addison Wesley Publishing Company, Massachusetts, 1995.
[2]
Peluso, V., Steyart, M., and Sansen, W., Design of Low-Voltage Low-Power CMOS Delta-Sigma A/D Converters. Kluwer Academic, Boston, 1999.
[3]
Rabii, Sh., Wooley, B. A., The Design of low-voltage, low-power Sigma-Delta Modulators. Kluwer Academic Publishers, Boston, 1999.
[4]
Razavi, B., Design of Analog CMOS integrated Circuits, McGraw-Hill, Boston, 2001.
[5]
Waltari, M., Halonen, K., A Switched-Opamp With Fast Common Mode Feedback, Proceedings of the 1999 IEEE International Conference on Electronics, Circuits and Systems, Sept 1999, Pafos, Cyprus, pp. 1523--1525.
[6]
Yan, S., and Sanchez-Sinencioo, S., Low-Voltage Analog Circuit Design Techniques: a Tutorial, IEICE Trans. Fundamentals, Vol.E83-A, No.2 February 2000.

Cited By

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  • (2017)A new fast rail-to-rail continuous-time common-mode feedback circuit2017 MIXDES - 24th International Conference "Mixed Design of Integrated Circuits and Systems10.23919/MIXDES.2017.8005238(387-391)Online publication date: Jun-2017
  • (2007)A novel common-mode sensing circuit with large input swing for Op-AMP with common-mode feedback2007 7th International Conference on ASIC10.1109/ICASIC.2007.4415668(465-468)Online publication date: Oct-2007

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  1. A novel continuous-time common-mode feedback for low-voltage switched-OPAMP

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    cover image ACM Conferences
    ISLPED '04: Proceedings of the 2004 international symposium on Low power electronics and design
    August 2004
    414 pages
    ISBN:1581139292
    DOI:10.1145/1013235
    Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for components of this work owned by others than ACM must be honored. Abstracting with credit is permitted. To copy otherwise, or republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. Request permissions from [email protected]

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    New York, NY, United States

    Publication History

    Published: 09 August 2004

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    Author Tags

    1. CMFB
    2. continuous-time
    3. delta-sigma
    4. low-voltage
    5. switched-OPAMP

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    ISLPED04
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    ISLPED04: International Symposium on Low Power Electronics and Design
    August 9 - 11, 2004
    California, Newport Beach, USA

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    Overall Acceptance Rate 398 of 1,159 submissions, 34%

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    • (2017)A new fast rail-to-rail continuous-time common-mode feedback circuit2017 MIXDES - 24th International Conference "Mixed Design of Integrated Circuits and Systems10.23919/MIXDES.2017.8005238(387-391)Online publication date: Jun-2017
    • (2007)A novel common-mode sensing circuit with large input swing for Op-AMP with common-mode feedback2007 7th International Conference on ASIC10.1109/ICASIC.2007.4415668(465-468)Online publication date: Oct-2007

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