基于生物应用的低截止频率5阶G_m-C低通滤波器

发布时间：2018-04-10 19:52

本文选题：跨导运算放大器(OTA) + 电流互抵　；参考：《半导体技术》2017年06期

【摘要】：设计了一款基于生物应用的截止频率为38.49 Hz的5阶跨导电容(G_m-C)低通滤波器。首先利用电流互抵技术设计实现了一款低G_m的运算跨导放大器(OTA),并基于此OTA,采用无源电感电容(LC)网络模拟法设计了一款5阶椭圆滤波器。最后基于华虹宏力0.35μm CD350 60 V/80 V工艺应用Spectre仿真工具对滤波器进行仿真。结果表明,所设计的低通滤波器可以实现非常陡峭的过渡带,并在50 Hz工频信号处衰减达-43.812 dB;阻带衰减为-33.18 dB;通带内平均噪声为352.0μV·Hz~(-1/2);总谐波失真为-56.24 d B;3.3 V电源电压下,5阶滤波器总功耗仅为11.73μW。所设计的滤波器可以有效采集频率极低的生物信号并且滤除干扰信号。芯片面积为1 200μm×728μm。
[Abstract]:A five-order transconducting Gm-C) low-pass filter with cutoff frequency of 38.49 Hz for biological applications is designed.A low Gm operational transconductance amplifier (OTAA) is designed and implemented by using current offset technique. Based on this OTAA, a 5th-order elliptical filter is designed by using passive inductance capacitor (LC) network simulation method.Finally, the filter is simulated using Spectre simulation tool based on Huahong Hongli 0.35 渭 m CD350 60 V / 80 V process.The results show that the designed low-pass filter can achieve a very steep transition zone.The designed filter can effectively collect very low frequency biological signals and filter interference signals.The chip area is 1 200 渭 m 脳 728 渭 m.
【作者单位】：西安电子科技大学微电子学院;
【分类号】：TN713.4

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