开关电容滤波器前置、后置滤波器的设计

开关电容滤波器前置、后置滤波器的设计
赵天成;赵英俊
【期刊名称】《电子设计工程》
【年(卷),期】2011(19)12
【摘要】For a switched-capacitor filter (SCF), it is important to configure its pre-filter and post-filter properly. There is a lack of systematic analysis and description for the problem. Based on the analysis of characteristics of SCF, a design method of pre-filter and post-filter for SCF was presented. Two design parameters of pre-filter and post-filter for SCF are cut-off frequency and attenuation. In designing a pre-filter or a post-filter, its attenuation should be determined according to system requirements first, and then its cut-off frequency should be determined according to the attenuation coefficient of a given filter structure. In this way, a programmable low-pass filter based on a MAX295 was designed for a 12-bit data acquisition system. The results show that the pre-filter and post-filter of the MAX295 could cover cut-off frequency range from l0Hz to
50kHz with 4 different cut-off frequencies, keeping minimum attenuation -74dB and -l0dB respectively.%如何为开关电容滤波器(SCF)合理配置前置、后置滤波器,一直缺少系统的分析和说明.在研究SCF工作特性的基础上,提出了SCF前置、后置滤波器的设计方法.SFC前置、后置滤波器的主要设计参数是转角频率和衰减量.设计时,先根据系统要求确定衰减量,再根据选定的滤波器结构的衰减系数确定转角频率.用此方法,结合12位数据采集系统需要,以MAX295为核心设计了一个
可程控低通滤波器.结果表明,MAX295的前、后置滤波器能以4档转角频率覆盖其10 Hz～50 kHz转角频率范围,前、后置滤波器的最小衰减量分别为-74 dB和-10 dB.
【总页数】4页(P143-146)
【作者】赵天成;赵英俊
【作者单位】武汉大学遥感与信息工程学院,湖北武汉430079;华中科技大学机械科学与工程学院,湖北武汉430074
【正文语种】中文
【中图分类】TN713
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