摘要基于Multisim仿真软件所具有的特点以及滤波器电路的工作原理，设计出基本的一阶低通滤波器电路结构，并对电路进行理论计算和软件仿真分析，将结果进行对比，初步确定整体的电路图以及各元件的参数。然后，在一阶低通滤波器电路的基础上进行级联，设计出二阶低通滤波器的基本结构，对电路进行理论分析，即计算出电路的传递函数和截止频率。其次，根据软件仿真结果分析电路的工作特性以及电路所存在的问题，提出解决办法，并加以修正。最后，根据理论结果将电路元件参数的进行不断优化调整，验证仿真结果，从而得到一个性能比较良好的二阶低通滤波器电路。整体的电路设计过程具有设计元件参数方便快捷，节省设计时间的特点。关键词：Multisim软件；二阶低通滤波器；理论计算；软件仿真IAbstractBasedonthecharacteristicsofMultisimsimulationsoftwareandtheworkingprincipleofthefiltercircuit,thebasicfirst-orderlow-passfiltercircuitstructureisdesigned,andthetheoreticalcalculationandsoftwaresimulationanalysisarecarriedoutonthecircuit.Theresultsarecomparedtodeterminetheoverallcircuitdiagram.Andtheparametersofeachcomponent.Then,basedonthefirst-orderlow-passfiltercircuit,thebasicstructureofthesecond-orderlow-passfilterisdesigned,andthecircuitistheoreticallyanalyzedtocalculatethetransferfunctionandcutofffrequencyofthecircuit.Secondly,accordingtothesoftwaresimulationresults,theworkingcharacteristicsofthecircuitandtheproblemsexistinginthecircuitareanalyzed,andthesolutionisproposedandcorrected.Finally,accordingtothetheoreticalresults,theparametersofthecircuitcomponentsarecontinuouslyoptimizedandverified,andthesimulationresultsareverified,sothatasecond-orderlow-passfiltercircuitwithgoodperformanceisobtained.Theoverallcircuitdesignprocesshasthecharacteristicsofconvenientandquickdesigncomponentparametersandsavesdesigntime.Keywords:Multisimsoftware;second-orderlow-passfilter;theoreticalcalculation;softwaresimulation目录摘要...............................................................IAbstract...........................................................II目录..............................................................III1引言............................................................12关于multisim软件的特点.........................................23滤波器的特点....................................................43.1滤波器的介绍...............................................43.2滤波器的分类...............................................43.3滤波器的性能参数...........................................53.4滤波器的频率响应...........................................64低通滤波器的设计方案............................................74.1低通滤波器的特点...........................................74.2低通滤波器的设计...........................................74.2.1低通滤波器的设计流程图................................74.2.2低通滤波器的设计步骤..................................84.3一阶低通滤波器的设计分析...................................94.3.1一阶低通滤波器的理论分析.............................104.3.2基于Multisim软件对一阶低通滤波器仿真分析............104.4二阶低通滤波器的设计分析..................................114.4.1对二阶低通滤波器的电路设计分析.......................124.4.2对二阶低通滤波器的理论分析...........................124.5加入反馈系统的二阶低通滤波器的分析与设计..................134.5.1对加入反馈系统的二阶低通滤波器的理论分析.............144.5.2基于Multisim软件的二阶低通滤波器仿真分析............144.5.3分析仿真所存在的问题及解决办法........
