A high-transconductance high-linearity CMFB circuit

ZHENG Kai-lun; GUO Gui-liang

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A high-transconductance high-linearity CMFB circuit

更新时间：2026-09-04

- A high-transconductance high-linearity CMFB circuit
- Vol. 37, Issue 7, Pages: 31-35(2020)
- 作者机构：
  
  1. 中国科学院机构微电子研究所,北京,100029
  2. 中国科学院大学机构,北京,101408
- 作者简介：
- 基金信息：
- DOI：
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- Published：2020
- 稿件说明：
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郑凯伦, 郭桂良. 一种高跨导增益高线性度的共模反馈电路[J]. 微电子学与计算机, 2020, 37(7): 31-35.

ZHENG Kai-lun, GUO Gui-liang. A high-transconductance high-linearity CMFB circuit[J]. 2020, 37(7): 31-35.
郑凯伦, 郭桂良. 一种高跨导增益高线性度的共模反馈电路[J]. 微电子学与计算机, 2020, 37(7): 31-35. DOI：

ZHENG Kai-lun, GUO Gui-liang. A high-transconductance high-linearity CMFB circuit[J]. 2020, 37(7): 31-35. DOI：

摘要

为了改善传统的差分误差放大型共模反馈在处理大摆幅差分输出时的非线性问题，采用源级退化电阻进行线性化补偿；同时提出了一种创新的电流复用型接法，在保持面积与功耗不变的同时增大了共模反馈的跨导增益，从而弥补源级退化造成的共模反馈环路增益与GBW的降低.在结合高速电流镜技术后可以在获得高增强效果的同时保持足够的相位裕度.

Abstract

In order to improve the linearity of the traditional differential-difference-amplifier common-mode feedback (CMFB) in dealing with the large amplitude differential output voltage

the source degeneration resistor is used. An innovative current-recycling method is proposed

with which the area and power consumption are constant while increasing the transconductance of the CMFB

thereby compensating for the reduction of the CMFB loop gain and GBW. In combination with high-speed current mirror technology

high enhancements can be achieved while maintaining sufficient phase margin.

关键词

Keywords

references

VOO T, TOUMAZOU C. High-speed current mirror resistive compensation technique[J]. Electronics Letters, 1995, 31(4): 248-250. DOI: 248

ZHANG M M, HURST P J.Effect of nonlinearity in the CMFB circuit that uses the differential-difference amplifier[C]//2006 IEEE International Symposium on Circuits and Systems. Kos, Greece, IEEE, 2006: 1393.

LOPEZ-MARTIN A J, GARDE M P, RAMIREZ-ANGULO J. Class AB differential difference amplifier for enhanced common-mode feedback[J]. Electronics Letters, 2017, 53(7): 454-456. DOI: 454

DUQUE-CARRILLO J F. Control of the common-mode component in CMOS continuous-time fully differential signal processing[J]. Analog integrated circuits and signal processing, 1993, 4(2): 131-140. DOI: 131

WHATLEY R A. Fully differential operational amplifier with DC common-mode feedback: U.S. Patent 4, 573, 020[P]. 1986-2-25.

LAH L, CHOMA J, DRAPER J. A continuous-time common-mode feedback circuit (CMFB) for high-impedance current-mode applications[J]. IEEE Transactions on Circuits and Systems Ⅱ: Analog and Digital Signal Processing, 2000, 47(4): 363-369. DOI: 363

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