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1、芳r疔勿帀翹多也M戶日匕线漩毕业设计（论文）(2013Bi)@：业:电子信息工M名：XXXX学号：XXXX指导教师：王兴和职称：教授填写日期：2013-04-30南京师范大学中北学院教务处制目前，小信号放大屯路的应用极其广泛，小到音箱、收音机等民用行业，大到卫星、火箭等军用行业。它不仅使我们的口常生活更加丰富多彩，而11对经济、国防等做出了不可磨灭的贡献。然而小信号有它自身的缺陷，由于它木身的能量较小，容易被噪声淹没或受到外界的干扰，而H对小信号放人电路设计的难处主耍在高性能运算放人器。运算放人器性
2、能的优劣决定该电路的性能。与国外相比国内对运算放人器的研究比较落后，导致对小信号放大电路的研究处于落后状态。基于0PA842TD,木设计介绍了小信号放大电路的探究与设计。该电路由五个0PA842TD组成的输入级差分放人屯路、中间级屯压放人屯路和输出级功率放人屯路完成对小信号的采集、电压放大和功率放大。同吋有效的抑制或消除电路的温漂和共模信号,使放大后的信号失真度较小。设计好后的电路，使用Multisim电路仿真软件对其进行仿真。通过施加正弦小屯压信号，从电路的静态工作点分析，交流分析等方面仿真，得出
3、电路的电压增益、带宽等仿真结果，进一步验证了电路理论设计的正确性和可行性。关键词：小信号放大电路0PA842IDMultisimAbstractCurrently,theapplicationofthesmallsignalcircuitisextremelywide,smalltospeakers,radiosandothercivilianindustry,largetosatellites,rocketsandothermilitaryindustiy.Itnotonlymakesourdai
4、lylifemorecolorful,butalsomadeanindeliblecontributiontotheeconomic,defenseandothers.However,thesmall-signalhasitsownflaws,becauseofitselfsmallerenergy,itiseasytodrownbythenoiseorinterferencebyoutside・Andthemaindifficultyofsmallsignalamplificationcircui
5、tdesignishigh-performanceoperationalamplifier.Theprosandconsoftheoperationalamplifierperformancedeterminetheperformanceofthecircuit.Comparedwithforeigncountries,thedomesticoperationalamplifierisrelativelybackward,leadtothestudyofthesmall-signalamplifie
6、rcircuitinabackwardstate.BasedonOPA842ID,thisdesignintroducesasmallsignalamplificationcircuitofinquiryanddesign.ThecircuitiscomposedbyfiveOPA842IDinputleveldifferentialamplifiercircuit,theintermediatestagevoltageamplifyingcircuitandtheoutputstagepowera
7、mplifyingcircuittocompletetheacquisitionofthesmallsignal,thevoltageamplificationandpoweramplification.Atthesametime,iteffectivelysuppressesoreliminatesthetemperaturedriftofthecircuitandthecommon-modesignal,makingtheamplifiedsignaldistortionsmaller.Afte
8、rcompletedthecircuitdesign,usingMultisimcircuitsimulationsoftwaretosimulate.Byapplyingasinusoidalvoltagesignal,fromthequiescentoperatingpointofthecircuitanalysis,ACanalysisandsoontosimulation,todrawthesimulationresultsofthevoltagegain,b
