一种用于ECG信号获取的低噪声斩波放大器  

Low⁃noise chopper amplifier for ECG signal acquisition

作　　者：马乾 张瑛 黄常华[1,2] 刘凯 MA Qian;ZHANG Ying;HUANG Changhua;LIU Kai(College of Electronic and Optical Engineering&College of Microelectronics,Nanjing University of Posts and Telecommunications,Nanjing 210023,China;National and Local Joint Engineering Laboratory of RF Integration and Micro-Assembly Technology,Nanjing University of Posts and Telecommunications,Nanjing 210023,China)

机构地区：[1]南京邮电大学电子与光学工程学院、微电子学院,江苏南京210023 [2]南京邮电大学射频集成与微组装技术国家地方联合工程实验室,江苏南京210023

出　　处：《南京邮电大学学报（自然科学版）》2021年第3期72-76,共5页Journal of Nanjing University of Posts and Telecommunications：Natural Science Edition

基　　金：国家自然科学基金(61106021);中国博士后科学基金(2015M582541)资助项目。

摘　　要：基于0.18μm CMOS工艺设计了一种应用于ECG信号采集的低噪声电容耦合斩波仪表放大器。该放大器采用斩波技术与晶体管噪声优化技术,减小了1/f噪声和热噪声,并提出一种基于占空比电阻的改进型前馈电极失调消除回路,抑制了电极直流失调电压。仿真结果表明,电路的静态电流为1.2μA,带宽为0.17 Hz~4.3 kHz,增益为40 dB,等效输入噪声为1.8μVrms(0.5~100 Hz),满足ECG信号采集的要求。A low⁃noise capacitively coupled chopper instrumentation amplifier for ECG signal acquisition is designed in 0.18μm CMOS process.The thermal noise and 1/f noise of the amplifier are reduced by the chopping technology and the transistor noise optimization technology.An improved feed⁃forward electrode offset elimination circuit based on duty⁃cycle resistor is proposed to suppress electrode DC offset voltage.Simulation results show that the circuit only consums 1.2μA quiescent current and achieves a 40 dB gain in the band from 0.17 Hz to 4.3 kHz,with the input referred noise of 1.8μVrms(0.5-100 Hz),thus meeting the requirements of ECG signal acquisition.

关 键 词：ECG信号 斩波技术 占空比电阻 前馈技术 

分 类 号：TN432[电子电信—微电子学与固体电子学]