A Low-Noise, High Input-Swing Instrument Amplifier

CHEN Jiu; WANG Xiao-song; ZHANG Hai-ying; LIU Yu

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A Low-Noise, High Input-Swing Instrument Amplifier

更新时间：2026-09-04

- A Low-Noise, High Input-Swing Instrument Amplifier
- Vol. 34, Issue 12, Pages: 40-44(2017)
- 作者机构：
  
  1. 中国科学院机构微电子研究所健康电子研发中心,北京,100029
  2. 中国科学院微电子研究所新一代通信射频芯片技术北京市重点实验室,北京,100029
  3. 中国科学院大学机构未来技术学院,北京,101400
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2017
- 稿件说明：
移动端阅览
陈就, 王小松, 张海英, 刘昱. 一种低噪声、宽输入摆幅仪表放大器[J]. 微电子学与计算机, 2017, 34(12): 40-44.

CHEN Jiu, WANG Xiao-song, ZHANG Hai-ying, et al. A Low-Noise, High Input-Swing Instrument Amplifier[J]. 2017, 34(12): 40-44.
陈就, 王小松, 张海英, 刘昱. 一种低噪声、宽输入摆幅仪表放大器[J]. 微电子学与计算机, 2017, 34(12): 40-44. DOI：

CHEN Jiu, WANG Xiao-song, ZHANG Hai-ying, et al. A Low-Noise, High Input-Swing Instrument Amplifier[J]. 2017, 34(12): 40-44. DOI：

摘要

介绍了一种基于SMIC 0.18 m CMOS工艺的低噪声、宽输入摆幅的仪表放大器设计.本文采用电流反馈型仪表放大器结构

通过改进整体电路结构

实现了很高的电极失调抑制能力

采用斩波技术减小低频闪烁噪声

采用直流抑制环路(DCOC)减小电路的失调.该电路的电源电压为1.2 V

功耗为56 W

等效带内输入噪声密度小于200 nV/√Hz

电极失调抑制可达±300 mV

CMRR大于110 dB

输入阻抗大于1 GΩ.

Abstract

A low-noise

high input-swing instrument amplifier for biopotential monitoring based on 0.18 m CMOS IC process is presented. This circuit is a current feedback amplifier

by improving the overall circuit structure

to achieve a very high electrode offset suppression. The circuit uses chopping technique to reduce flicker noise and uses DC offset cancellation loop to reduce amplifier offset. The proposed circuit consumes 56 W from a 1.2 V supply

with in-band input-referred voltage noise density lower than 200 nV/√Hz

CMRR larger than 110 dB

±300 mV electrode offset suppression and input impedance larger than 1 GΩ.

关键词

Keywords

references

Qinwen Fan, Fabio Sebastiano, Johan H. Huijsing, et al. A 1.8 μW 60 nV/Hz capacitively-coupled chopper instrumentation amplifier in 65 nm CMOS for wireless sensornodes[J]. IEEE JSSC, 2011, 46(7): 1534-1543. DOI: 1534

Refet Firat Yazicioglu, Tom Torfs, Patrick Merken, et al. Ultra-low-power biopotential interfaces and their applications in wearable and implantable systems [J]. Microelectronics Journal, 2009, 40(9): 1313-1321. DOI: 1313

Yazicioglu R F, Torfs T, Merken P, et al. Texas instruments ADS1292R, low-power, 8Channel, 24Bit AFE for biopotential measurements[J]. Microelectronics Journal, 2009, 40(9): 1313-1321. DOI: 1313

Refet Firat Yazicioglu, Patrick Merken, Robert Puers, et al. A 60 μW 60 nV/Hz readout front-end for portable biopotential acquisition systems [J]. IEEE JSSC, 2007, 42(5): 100-1110. DOI: 100

Christian C Enz, Eric A Vittoz, Fran Cois Krummenacher. A CMOS chopper amplifier [J]. IEEE JSSC, 1987, SC-22(3): 335-342. DOI: 335

Nick Van Helleputte, Mario Konijnenburg, Julia Pettine, A 345μW multi-sensor biomedical soc with bio-impedance, 3-channel ecg, motion artifact reduction, and integrated DSP [J]. IEEE JSSC, 2015, 50(1): 230-244. DOI: 230

Christian C Enz, Gabor C Temes. Circuit techniques for reducing the effects of op-amp imperfections: auto-zeroing, correlated double sampling, and chopper stabilization [J]. IEEE JSSC, 1981, SC-16(6): 1584-1614. DOI: 1584

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