一种新型可控低通滤波器的研制

英文篇名：Development of a new type controllable low-pass filter
中文刊名：电子元件与材料
英文刊名：Electronic Components and Materials
作者：李怀良 ; 庹先国 ; 任家富 ; 王诗东 ; 葛维亮
英文作者：LI Huailiang1 ; 2 ; TUO Xianguo1 ; 2 ; REN Jiafu1 ; 2 ; WANG Shidong1 ; GE Weiliang1(1.State Key Laboratory of Geo-hazard Prevention & Geo-environment Protection ; Chengdu 610059 ; China ; 2.Key Laboratory of Earth Exploration & Information Technology of Ministry of Education ; Chengdu 610059 ; China)
中文关键词：低通滤波器 ; 可控截止频率 ; 三线控制
英文关键词：low-pass filter ; controllable cut-off frequency ; three wire control
出版日期：2010-01-05
机构：地质灾害防治与地质环境保护国家重点实验室;地球探测与信息技术教育部重点实验室;
年：2010
期：01
出版单位：电子元件与材料

摘要

针对工程地震数据采集系统中程控滤波器设计时所需控制引脚较多的弊端,研制出一种仅三线控制且品质因数Q为8的可调截止频率高速低通滤波器。通过设定开关电容滤波器MAX263可编程引脚固定的编码值,并利用分频器和高速模拟开关选取MAX263的时钟输入频率,以达到其截止频率可调的目的。测试结果表明,该滤波器对阻带信号幅度衰减稳定在–21 dB以下,且截止频率切换时延稳定在3μs以内,已成功运用于浅层数字地震仪。
For the drawbacks of much more control pins required with the programmable filter design in seismic data acquisition system,a high-speed adjustable cut-off frequency low-pass filter with only three control pins and Q value of 8 was designed and developed.The MAX263 programmable pins were set as fixed code values,and frequency divider and high-speed analog swith were used to select the clock input frequency of MAX263 swith capacitance filter to achieve adjustable cut-off frequency.Test results show that the attenuation level of stopband signal amplitude of the filter keep less than –21 dB,and the delay of cut-off frequency switch keep less than 3 μs.It has been successfully used in the project of shallow digital seismograph.

引文

[1]李旭涛,丁国清.基于MAX268的自动跟踪滤波器的研究与应用[J].电测与仪表,2006,43(3):56-64.
    [2]袁子龙,狄帮让,肖忠祥.地震勘探仪器原理[M].北京:石油工业出版社,2006:76-80.
    [3]余小平,奚大顺.电子系统设计-基础篇[M].北京:北京航空航天大学出版社,2007:125-130.
    [4]倪向东.单片机控制的双路有源滤波器设计[J].电子技术应用,2002,28(1):13-15.
    [5]陈世夏,李树峰,戚甫峰,等.应用MAX264设计程控滤波器[J].电子测量技术,2008,31(4):171-174.
    [6]赵国库,陈荷娟,张志安,等.深弹主动声引信信号处理电路中滤波器的设计[J].弹箭与制导学报,2004,(6):66-68.
    [7]郑国恒,李秀红,杨洁,等.全频点轨道绝缘测试仪的实现[J].微计算机信息,2007,10:188-195.
    [8]MATHEWS J H,FINK K D.Numerical methods using MATLAB[M].3rd ed.USA:Pearson Education,2002:196-202.
    [9]罗军辉,罗勇江,白义臣.MATLAB 7.0在数字信号处理中的应用[M].北京:机械工业出版社,2005:83-102.