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本科学生毕业设计程控低通滤波器的设计院系名称:电气与信息工程学院专业班级:电子信息工程11-2班学生姓名:马恒坤指导教师:刘静森职称:副教授黑龙江工程学院二○一五年六月TheGraduationDesignforBachelor'sDegreeDesignofProgramControlledLowPassFilterCandidate:MaHengkunSpecialty:ElectronicInformationEngineeringClass:11-2Supervisor:AssociateProf.LiuJingsenHeilongjiangInstituteofTechnology2015-06·Harbin黑龙江工程学院本科生毕业设计I摘要本设计是基于单片机的程控低通滤波器系统方案的设计思想和实现方法。系统以高性能、低成本AT89LV52为核心控制器配合CD4051模拟开关实现程序控制选择滤波电路的设计方法。利用LM358AD运算放大器设计两个电压跟随器,利用其输入阻抗高等特点实现频率信号的缓冲与隔离干扰的作用,然后让信号输入运放的正相端,利用LM358AD实现同相输入的压控电压源二阶低通滤波电路,最后将滤波的结果用液晶进行显示。本设计首先简单介绍了程控低通滤波器的发展现状,结合系统设计方案的要求,详细论证了实现二阶低通滤波器方案的设计思路及系统的总体架构。然后,详尽地阐述了系统的硬件电路结构和完成各项功能相关的软件设计。最后,利用Multisim软件进行了电路仿真。系统结构简单,可靠性高,功能易扩展,适用于多种应用领域。关键字:AT89LV52;模拟电子开关;LM358AD;滤波器;Multisim黑龙江工程学院本科生毕业设计IIABSTRACTThisdesignisthedesignideaandrealizationmethodoftheprogrammablelowpassfiltersystemschemebasedonMCU.ThesystemtakestheAT89LV52asthecorecontrollerfeaturedwithhighperformanceandlowcostcoordinatedwiththeCD4051simulationswitchtorealizethedesignmethodofchoosingthefilteringcircuitwithprogramcontrol.WiththehelpoftwovoltagefollowerfeaturedwithinputimpedanceandLM358ADoperationalamplifier,achievetheroleoffrequencysignalbufferandisolationinterference,thenletthesignalenterthepositivephase.UtilizeLM358ADtorealizethesecond-orderlow-passfiltercircuitofvoltagecontrolsourcewithnon-invertinginput.Finally,theresultsofthefilteraredisplayedwithLCD.Thesubjectofthisdesignisnlow-passfilterwithprogramcontrolincombinationwiththesystemdesignrequirements.Demonstratethedesignideaandtheoverallframeworkofthesecond-orderlow-passfilterindetail,then,describethehardwarecircuitstructureandthesoftwaredesignofthesystemindetail.Atlast,thecircuitsimulationiscarriedoutusingMultisimsoftware.Thesystemhastheadvantagesofsimplestructure,highreliability,easyexpansionandcanbeappliedininmanykindsofapplicationfields.Keywords:AT89LV52;AnalogElectronicSwitch;LM358AD;Filter;Multisim黑龙江工程学院本科生毕业设计目录摘要.........................................................................................................................................IAbstract...............................................................................................................................II第1章引言.......................................................................................................................11.1课题研究目的和意义...............................................................................................11.2国内外研究现状和发展趋势...................................................................................11.3各章节主要内容.......................................................................................................2第2章整体方案设计...................................................................................................................42.1系统设计的需求.......................................................................................................42.2系统方案的选择.......................................................................................................42.3本章小结...................................................................................................................6第3章硬件设计..............................................................................................................73.1微控制器电路设计...................................................................................................73.2低通滤波电路设计...................................................................................................83.3显示控制电路设计.................................................................................................103.4电源电路设计.........................................................................................................113.5本章小结.................................................................................................................11第4章软件设计............................................................................................................134.1总体程序设计..........................................................................................................134.2程控通道程序设计.................................................................................................154.3按键去抖动程序设计.............................................................................................154.4本章小结.................................................................................................................17第5章仿真与测试.......................................................................................................185.1Multisim电路仿真..................................................................................................185.2实物调试.................................................................................................................21黑龙江工程学院本科生毕业设计5.3本章小结.................................................................................................................26结束语.................................................................................................................................27参考文献.............
本文标题:程控低通滤波器的设计
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