李春龙,徐卫林,韦保林,乔帅领,段吉海,韦雪明

• 1:桂林电子科技大学广西精密导航技术与应用重点实验室

摘要(Abstract)：

传统的Gm-C滤波器OTA输入晶体管大多工作在饱和区,存在输入动态范围较小和跨导值较大等不足,难以满足生物医学电信号处理滤波器所要求的超低截止频率、低功耗与大输入动态范围等要求,采用将输入晶体管钳位到线性工作区的方法,设计了跨导线性可调的OTA以提高滤波器能够处理的信号幅度。并应用该OTA综合了一种五阶Gm-C超低频低通滤波器。仿真结果表明,该滤波器在1.8 V电源,800 m Vpp输入条件下实现了283 Hz的超低低通角频率,-6.4 d B的带内增益,51 d B的三次谐波失真,功耗仅为22μW,适用于可穿戴式生物医学电信号读取电路。

关键词(KeyWords)： 跨导-电容低通滤波器;运算跨导放大器;线性可调;生物医学信号;输入动态范围;低功耗

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金资助项目(61264001);; 广西自然科学基金资助项目(2014GXNSFAA118386;2015GXNSFAA139301);; 广西精密导航技术与应用重点实验室项目(DH201504)~~

作者(Author): 李春龙,徐卫林,韦保林,乔帅领,段吉海,韦雪明

DOI: 10.16652/j.issn.1004-373x.2018.04.021

参考文献(References)：

• [1]WILLAMS A B,TAYLOR F J.Electronic filter design handbook[M].New York:Mc Graw-Hill,2006.
• [2]GALAN J,PEDRO M,SANCHEZ-RODRIGUEZ T,et al.A very linear low-pass filter with automatic frequency tuning[J].IEEE transactions on very large scale integration systems,2013,21(1):182-187.
• [3]段吉海,郝强宇,徐卫林,等.一种适用于心电信号检测的斩波前置放大器[J].微电子学,2016(1):29-33.DUAN Jihai,HAO Qiangyu,XU Weilin,et al.A chopper stabilized preamplifier for ECG signal acquisition[J].Microelectronics,2016(1):29-33.
• [4]SCHAUMANN R,XIAO H,VAN VALKENBURG M E.Design of analog filters[M].Oxford:Oxford University Press,2001.
• [5]DE LIMA J A,DUALIBLE C.A linearly tunable low-voltage CMOS transconductor with improved common-mode stability and its application to Gm-C filters[J].IEEE transactions on circuits&systems II analog&digital signal processing,2001,48(7):649-660.
• [6]DUAN Jihai,LAN Chuang,XU Weilin.An OTA-C filter for ECG acquisition systems with highly linear range and less passband attenuation[J].Journal of semiconductors,2015,36(5):120-125.
• [7]SOLIS-BUSTOS S,SILVA-Martínez J,MALOBERTI F.A 60-d B dynamic-range CMOS sixth-order 2.4 Hz low-pass filter for medical application[J].IEEE transactions on circuits systems II analog&digital signal processing,2000,47(12):1391-1398.
• [8]LASANEN K,KOSTAMOVAARA J.A 1-V analog CMOS frontend for detecting QRS complexes in a cardiac signal[J].IEEE transactions on circuits&systems I:regular papers,2005,52(12):2584-2594.
• [9]LEE S Y,CHENG C J.Systematic design and modeling of a OTA-C filter for portable ECG detection[J].IEEE transactions on biomedical circuits&systems,2009,3(1):53-64.
• [10]MAHMOUD S A,BAMAKHRAMAH A,AL-TUNAIJI S A.Low-noise low-pass filter for ECG portable detection systems with digitally programmable range[J].Circuits systems and signal processing,2013,32(5):2029-2045.
• [11]周德福,张勇虎,葛锐,等.可变带宽OTA-C连续时间低通滤波器设计[J].现代电子技术,2011,34(6):157-159.ZHOU Defu,ZHANG Yonghu,GE Rui,et al.Design of variablebandwidth OTA-C continuous-time low-pass filter[J].Modern electronics technique,2011,34(6):157-159.