高纯度脉搏信号处理电路的设计与实现  

Design and Implementation of High Purity Pulse Signal Processing Circuit

作　　者：刘智 童耀南 崔建山 宋伟 陈振光 LIU Zhi;TONG Yaonan;CUI Jianshan;SONG Wei;CHEN Zhenguang(School of Information Science and Engineering,Hunan Institute of Science and Technology,Yueyang 414006,China;Hunan Engineering Research Center of Multimodal Health Sensing and Intelligent Analysis,Yueyang 414006,China;Dongguan Zhenhai Electronic Technology Co.,Ltd.,Dongguan 523430,China)

机构地区：[1]湖南理工学院信息科学与工程学院,湖南岳阳414006 [2]多模态健康传感与智能分析湖南省工程研究中心,湖南岳阳414006 [3]东莞市振海电子科技有限公司,广东东莞523430

出　　处：《湖南理工学院学报（自然科学版）》2024年第3期44-50,共7页Journal of Hunan Institute of Science and Technology(Natural Sciences)

基　　金：湖南省自然科学基金项目(2023JJ30283);湖南理工学院研究生科研创新项目。

摘　　要：针对脉搏信号幅值微弱易受干扰等问题,设计一款高纯度脉搏信号处理电路.首先,通过轨对轨满摆20dB放大器,对信号进行前置放大和二次放大,使信号达到易处理幅值.其次,采用基于UAF42的工频陷波器去除电力系统中的工频干扰.最后,设计八阶巴特沃斯低通滤波器应用于脉搏信号处理中,滤波器采用Sallen-Key拓扑结构以减少电路元件使用.实验结果表明,处理电路能有效抑制工频干扰且中心频率±0.5 Hz可调,巴特沃斯低通滤波器能在不丢失原始信号的前提下去除高频噪声,以硬件方式实现脉搏信号的放大与提纯.To address the challenges associated with inadequate pulse signal amplitude and susceptibility to interference,this paper presents the design of a high-purity pulse signal processing circuit.Firstly,employing a rail-to-rail,full-swing 20 dB amplifier,the signal is pre-amplified and subsequently re-amplified to facilitate optimal processing amplitude.Secondly,a notch filter,based on the UAF42,is utilized to eliminate power frequency interference within the power system.Finally,an eighth-order Butterworth low-pass filter is designed for pulse signal processing,utilizing a Sallen-Key topology to minimize the number of circuit components.The test results demonstrate that the processing circuit effectively suppresses power frequency interference,with an adjustable center frequency of±0.5 Hz.Furthermore,the Butterworth low-pass filter effectively removes high-frequency noise without compromising the integrity of the original signal,thereby enhancing both the hardware amplification and purification of pulse signals.

关 键 词：脉搏信号 UAF42 工频干扰 巴特沃斯滤波器 Sallen-Key拓扑 

分 类 号：TN710.9[电子电信—电路与系统]