대한전자공학회논문지SD (Journal of the Institute of Electronics Engineers of Korea SD)

대한전자공학회 (The Institute of Electronics and Information Engineers)
권호 표지

Common Mode Feedback 회로를 위한 저 증폭도 에러증폭기

A low-Gain Error Amplifier for Common-Mode Feedback Circuit

  • Published : 2003.09.01
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

Abstract

아날로그 IC의 signal swing을 증가시키고 노이즈를 감소시키는 효율적이고 기본적인 방법은 fully-differential 회로를 이용하는 것이다. 하지만 differential-mode 신호처리에 영향을 미치는 common-mode 출력 레벨을 안정되도록 하기 위해서는 common-mode feedback (CMFB)회로가 사용되어야 한다. 본 논문에서는 CMFB 구성과 출력 레벨을 안정되도록 하기 위해 사용되는 에러증폭기 회로들의 설계 방법을 기술하고, 트랜지스터들로만 구성된 효율적인 저 증폭도 에러증폭기론 제안한다. 제안된 에러증폭기는 phase margin 증가 및 differential-mode 입력 신호의 swing 폭을 증가시킨다.

An effective technique to increase the signal swing and reduce noise is to use fully-differential -circuits. However, design of a common-mode feedback (CMFB) circuit that stabilizes the common-mode output level is essential. In this paper, a general description is given to fully-differential amplifiers with their CMFB loops, then a new error amplifier that is just composed of transistors and stabilizes the DC output level is proposed. We designed a simple and efficient bias circuit that allows the stability and maximum input swing. Simulation result shows the enhanced phase margin and increased differential-mode input swing with a proposed error amplifier.

Keywords

References

  1. B. Razavi, Design of Analog CMOS Intergrated Circuits, McGraw-Hill, 2001
  2. F. Mistlberger, and R. Koch, 'Class-AB High-Swing CMOS Power Amplifier', IEEE Journal of Solid-State Cricuits, Vol. 27, No. 7, pp. 1089-1092, July 1992 https://doi.org/10.1109/4.142606
  3. J. Kih, B. Chang, and D. K. Jeong, 'Class-AB Large-Swing CMOS Buffer Amplifier With Controlled Bias Current', IEEE Journal of Solid-State Circuitsl, Vol. 28, No. 12, pp. 1350-1353, Dec. 1993 https://doi.org/10.1109/4.262009
  4. W. G. Garrett, and T. G. Maxfield, 'A Monolithic Differential-Output Operational Amplifier', Digest of Technical Papers, International Solid-State Circuits Conf., Philadelphia, PA, Feb. 1972
  5. M. Banu, J. M. Khoury, and Y. Tsividis, 'Fully Differential Operational Amplifiers With Accurate Output Balancing,' IEEE Journal Solid-State Circuits, Vol. 23, No. 6, pp. 1410-1414, Dec. 1988 https://doi.org/10.1109/4.90039
  6. P. R. Gray, P. J. Hurst, S. H. Lewis, and R. G. Meyer, Analysis And Design Of Analog Integrated Circuits, John Wiley & Sons, Inc., 2001
  7. I. Grech, J. Micallef, and T. Vladimirova, 'Low Voltage, High Speed Fully Differential CMOS Op Amp', Eletronics, Circuits and Systems, 2000. ICES 2000. The 7th IEEE International Conference on, Vol. 1, pp. 7-10, 2000 https://doi.org/10.1109/ICECS.2000.911464
  8. G. Xu, S. H. K. Emababi, 'A Systematic Approach In Constructing Fully Differential Amplifiers', IEEE transactions on circuits and systems, Vol. 47, No. 11, pp. 1343-1347, Nov. 2000 https://doi.org/10.1109/82.885146