ECG系统中低功耗高线性G_m-C滤波器  

Low Power High Linear G_m-C Filter for Electrocardiogram System

作　　者：张千文[1,2] 黄继伟[1,2] 张荣晶 陈俊龙[1] 吴嘉士 

机构地区：[1]福州大学物理与信息工程学院,福州350108 [2]福建省集成电路设计中心,福州350002

出　　处：《微电子学》2015年第4期525-528,532,共5页Microelectronics

基　　金：福建省科技厅重点项目(2013H0026);福建省教育厅资助项目(JA12029)

摘　　要：采用SMIC 0.18μm CMOS工艺,设计了一种应用于无线心电图检测系统的5阶Gm-C巴特沃斯低通滤波器,滤波器的综合采用流图法模拟无源LC梯形网络结构。基于MOS晶体管的亚阈值导电性以及源级负反馈的线性化技术,设计了一种低功耗、高线性的OTA。仿真结果显示,滤波器-3dB截止频率为256Hz,当输入频率为100 Hz,Vpp为100mV的正弦信号时,滤波器3阶谐波失真为-56.91dB,阻带衰减率达到99.77dB/dec,静态功耗为0.8mW。A 5th order Butterworth Gm-C low pass filter （LPF） for wireless electrocardiogram （ECG） detection system was designed based on the SMIC 0. 18μm CMOS process. A passive LC ladder filter was emulated with the signal flow graph （SFG） method. As a key building block for the filter, a low power high linear operational transconductance amplifier （OTA） was designed based on MOSFET＇s subthreshold conductive characteristics and the source negative feedback linearization technique. The simulation results showed that the --3 dB cut-off frequency of the filter was 256 Hz. The third order harmonic distortion was --56.91 dB when the input was applied to a sine signal with a peak of 100 mV and a frequency of 100 Hz. Meanwhile, the stop band attenuation of the filter reached 99.77 dB/dec, and the total power consumption was 0.8 mW.

关 键 词：心电图检测 GM-C滤波器 亚阈值导电 高线性度 

分 类 号：TN432[电子电信—微电子学与固体电子学]