基于VCA610自动增益放大器的设计

2015届毕业设计说明书基于VCA610的自控增益放大器的设计院部：电气与信息工程学院学生姓名：许君指导教师：职称专业：电子信息工程班级：电子XXXX班完成时间：2015年6月I摘要社会的进步离不开先进的生产力，而生产力的提高需要依托强大的技术支持，尤其是自动增益控制技术。自动增益控制（AGC）在各行各业都有着广泛的应用，比如：仪器仪表与检测技术、低压电器技术、自动控制技术、工业机器人技术和工业通信技术。自动增益控制技术与生活息息相关，对它的学习也显得格外重要。设计一个自控增益放大器，可以采用VCA610放大器来搭建自动增益放大电路，电路设计简单，易于实现信号的自动控制。基于VCA610的自动增益控制系统，采用MSP430F169单片机作为控制器，对VCA610放大器提供控制电压，使其控制的信号输出稳定的幅值，输出的交流信号通过OPA620放大电路、三极管推挽电路；输出的直流信号通过放大电路、扩流电路；信号分别经过交直流处理，带负载能力得到提高，能够实现设计要求，这样一个完整的基于VCA610的自控增益放大系统就搭建完成了,通过仿真调试，根据结果，分析得出结论。通过VCA610自动增益放大电路的学习，能够加强人们对自动增益控制电路的认识，由浅入深，以此来学习更加复杂、设计更加优良的自动增益控制电路。这样就能够使自控技术更加的成熟、先进，使大家的生活更加丰富多彩。关键词：自动增益控制；MSP430F169；VCA610；放大器；调试IIABSTCACTTheprogressofthesocietyisinseparablefromtheadvancedproductiveforces,andproductivityrelyonstrongtechnicalsupport,especiallytheautomaticgaincontroltechnology.Automaticgaincontrol(AGC)hasbeenwidelyusedinallwalksoflife,forexample:Instrumentationandtestingtechnology,lowvoltageelectricaltechnology,automaticcontroltechnology,industrialrobottechnologyandcommunicationtechnologyindustry.Automaticgaincontroltechnologyiscloselyrelatedtolife,andtostudythetechnologyisveryimportant.VCA610amplifiercanbeusedtobuildautomaticgainamplifiercircuitfordesigninganautomaticgainamplifier,thedesignissimple,andeasytorealizeautomaticcontrolofsignals.TheautomaticgaincontrolsystemisbasedonVCA610,usingMSP430F169microcontrollerascontroller,thecontrollerprovidescontrolvoltageforVCA610amplifier,andmakeitscontrolsignaloutputstable,TheoutputoftheACsignalthroughOPA620amplificationcircuitandtransistorpush-pullcircuit;TheDCsignaloutputthroughmagnifyingcircuitandexpandingflowcircuit;SignalistreatedrespectivelywithAC/DC,andLoadwillbeenhanced,so,itwillreachtothedesignrequirements,acompleteautomaticgainamplifiersystemwhichissetupcompletedbyVCA610,throughsimulatinganddebugging,reachtoresults,anddrawaconclusion.ThroughstudyingVCA610automaticgainamplifiercircuit,itcanstrengthenpeople'sknowledgeofautomaticgaincontrolcircuit,inordertolearnmorecomplex,moreexcellentdesignofautomaticgaincontrolcircuit.Itwasabletofurtherautomaticcontroltechnologymatureandadvanced,inaddition,itmakepeople'slivesmorecolorful.Keywordsautomaticgaincontrol;MSP430F169;VCA610;amplifier;debuggingIV目录1绪论..........................................................................................................................11.1研究课题的背景及意义.................................................................................11.2研究课题的主要工作.....................................................................................22总体设计思想与方案..............................................................................................32.1总体设计思想.................................................................................................32.2总体设计概述.................................................................................................32.3方案选择.........................................................................................................42.3.1控制器的选择......................................................................................42.3.2信号处理电路的选择..........................................................................52.3.3方案总结..............................................................................................83硬件系统的设计....................................................................................................103.1主要器件介绍...............................................................................................103.1.1MSP430F169单片机........................................................................103.1.2VCA610运放芯片............................................................................113.1.3OPA620运放芯片.............................................................................113.1.4OPA2604放大芯片...........................................................................123.1.5LM317电压稳压器...........................................................................123.1.612864液晶显示.................................................................................133.2单元电路设计...............................................................................................143.2.1MSP430F169单片机最小系统........................................................143.2.2下载电路............................................................................................163.2.3LCD12864液晶显示电路.................................................................173.2.4VCA610自动控制电路....................................................................183.2.5直流电路............................................................................................193.2.6交流电路............................................................................................204软件系统的设计....................................................................................................214.1软件设计概述...............................................................................................214.2软件模块程序...............................................................................................214.2.1液晶显