A Low noise chopper current feedback instrumentation amplifier

WANG Wei; WANG Yi-chang; Chio U-Fat; ZHOU Kai-li; WANG Guang; LIU Dong-xu; YUAN Jun

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A Low noise chopper current feedback instrumentation amplifier

更新时间：2026-09-04

- A Low noise chopper current feedback instrumentation amplifier
- Vol. 36, Issue 12, Pages: 48-52(2019)
- 作者机构：
  
  重庆邮电大学机构光电工程学院,重庆,400065
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2019
- 稿件说明：
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王巍, 王伊昌, 赵汝法, 周凯利, 王广, 刘东旭, 袁军. 一种低噪声的斩波电流反馈仪表放大器[J]. 微电子学与计算机, 2019, 36(12): 48-52.

WANG Wei, WANG Yi-chang, Chio U-Fat, et al. A Low noise chopper current feedback instrumentation amplifier[J]. 2019, 36(12): 48-52.
王巍, 王伊昌, 赵汝法, 周凯利, 王广, 刘东旭, 袁军. 一种低噪声的斩波电流反馈仪表放大器[J]. 微电子学与计算机, 2019, 36(12): 48-52. DOI：

WANG Wei, WANG Yi-chang, Chio U-Fat, et al. A Low noise chopper current feedback instrumentation amplifier[J]. 2019, 36(12): 48-52. DOI：

摘要

提出了一种应用于生物电信号采集的低噪声仪表放大器

该电路采用带有米勒补偿的三级电流反馈结构来实现高共模抑制比

采用两级斩波结构显著减少1/噪声和直流失调(DC offset)

采用二阶Sallen-Key低通滤波器消除了由于斩波开关引入的输出纹波(Ripple).该电路采用SMIC 0.13 μm CMOS工艺进行设计

在1.2 V电源电压下消耗电流为48 μA

输入参考噪声功率谱密度(PSD)为26 nV/rtHz

噪声效率因子(NEF)值为6.4

共模抑制比为114 dB.仿真结果表明

在第一谐波处

该电路将高频输出纹波降低了1/43倍.

Abstract

A low-noise instrumentation amplifier isproposed for biopotential signals acquisition. This circuit use a three-stage current feedback topology with miller compensation to achieve a high common-mode rejection ratio. A two-stage chopping structure is used to significantly reduce 1/f noise and DC offset. The output ripple introduced by the chopper switch is eliminated by implanting a second-order Sallen-Key low-pass filter. The circuit is designed in a SMIC 0.13 μm CMOS process with a current dissipation of 48μA at 1.2 V supply voltage

and the input reference noise power spectral density (PSD) is 26nV/rtHz

the noise efficiency factor (NEF) is 6.4 and the common mode rejection ratio is 114 dB. The simulation results show that at the first harmonic

the circuit reduce the high-frequency output ripple by a factor of 1/43.

关键词

Keywords

references

DOOL B J V D, HUIJSING J K. Indirect current feedback instrumentation amplifier with a common-mode input range that includes the negative roll[J]. IEEE Journal of Solid-State Circuits, 2002, 28(7):743-749. DOI: 743

LEE H S, NGUYEN V N, PHAM X L, et al. A 250-μW, 18-nV/rtHz current-feedback chopper instrumentation amplifier in 180-nm cmos for high-performance bio-potential sensing applications[J]. Analog Integrated Circuits and Signal Processing, 2017, 90(1):137-148. DOI: 137

ZHENG J, KI W H, HU L, et al. Chopper Capacitively-Coupled Instrumentation Amplifier Capable of Handling Large Electrode Offset for Biopotential Recordings[J]. IEEE Transactions on Circuits and Systems II: Express Briefs, 2017, 64(12):1392-1396. DOI: 1392

KELLY S D T, SURYADEVARA N K, MUKHOPADHYAY S C. Towards the Implementation of IoT for Environmental Condition Monitoring in Homes[J]. IEEE Sensors Journal, 2013, 13(10):3846-3853. DOI: 3846

WU R, MAKINWA K A A, HUIJSING J H. A Chopper Current-Feedback Instrumentation Amplifier With a 1 mHz1/f Noise Corner and an AC-Coupled Ripple Reduction Loop[J]. IEEE Journal of Solid-State Circuits, 2009, 44(12):3232-3243. DOI: 3232

ZOU X, XU X, YAO L, et al. A 1-V 450-nW fully integrated programmable biomedical sensor interface chip[J]. IEEE Journal of Solid-State Circuits, 2009, 44(4):1067-1077. DOI: 1067

ZHANG Y, SUN L, SONG H, et al. Ubiquitous WSN for Healthcare: Recent Advances and Future Prospects[J]. IEEE Internet of Things Journal, 2014, 1(4):311-318. DOI: 311

SAAD M, El-NOZAHI M, RAGAI H. Low noise chopper instrumentation amplifier with feed-forward ripple suppression technique[C]// 2016 28th International Conference on Microelectronics (ICM).Giza, EgyptIEEE Press, 2016, 305-308.

AHMED M, MOHAMAD S, BERMAK A. A power-efficient current-feedback instrumentation amplifier for precision bridge readout[C]// IEEE International Conference on Electron Devices % Solid-state Circuits.SingaporeSingaporeIEEE Press, 2015, 555-558.

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