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1、毕业设计（论文）题目：小信号放大电路的探究第34页摘要目前，小信号放大电路的应用极其广泛，小到音箱、收音机等民用行业，大到卫星、火箭等军用行业。它不仅使我们的日常生活更加丰富多彩，而且对经济、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，由于它本身的能量较小，容易被噪声淹没或受到外界的干扰，而且对小信号放大电路设计的难处主要在高性能运算放大器。运算放大器性能的优劣决定该电路的性能。与国外相比国内对运算放大器的研究比较落后，导致对小信号放大电路的研究处于落后状态。基于OPA842ID，本设计介绍了小信号放大电路的探究与
2、设计。该电路由五个OPA842ID组成的输入级差分放大电路、中间级电压放大电路和输出级功率放大电路完成对小信号的采集、电压放大和功率放大。同时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。通过施加正弦小电压信号，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OPA842IDMultisim第34页AbstractCurrently,theapplic
3、ationofthesmallsignalcircuitisextremelywide,smalltospeakers,radiosandothercivilianindustry,largetosatellites,rocketsandothermilitaryindustry.Itnotonlymakesourdailylifemorecolorful,butalsomadeanindeliblecontributiontotheeconomic,defenseandothers.However,thesmall-sig
4、nalhasitsownflaws,becauseofitselfsmallerenergy,itiseasytodrownbythenoiseorinterferencebyoutside.Andthemaindifficultyofsmallsignalamplificationcircuitdesignishigh-performanceoperationalamplifier.Theprosandconsoftheoperationalamplifierperformancedeterminetheperforman
5、ceofthecircuit.Comparedwithforeigncountries,thedomesticoperationalamplifierisrelativelybackward,leadtothestudyofthesmall-signalamplifiercircuitinabackwardstate.BasedonOPA842ID，thisdesignintroducesasmallsignalamplificationcircuitofinquiryanddesign.Thecircuitiscompos
6、edbyfiveOPA842IDinputleveldifferentialamplifiercircuit,theintermediatestagevoltageamplifyingcircuitandtheoutputstagepoweramplifyingcircuittocompletetheacquisitionofthesmallsignal,thevoltageamplificationandpoweramplification.Atthesametime,iteffectivelysuppressesorel
7、iminatesthetemperaturedriftofthecircuitandthecommon-modesignal,makingtheamplifiedsignaldistortionsmaller.Aftercompletedthecircuitdesign,usingMultisimcircuitsimulationsoftwaretosimulate.Byapplyingasinusoidalvoltagesignal，fromthequiescentoperatingpointofthecircuitana
8、lysis,ACanalysisandsoontosimulation,todrawthesimulationresultsofthevoltagegain,bandwidth,etc,furthervalidatethecorrectnessandfeasibilityofthecirc
