资源描述:
《高频电路设计及制作接收论文说明书》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、桂林电子科技大学课程设计(论文)报告用纸第2页共2页摘 要随着现代社会的快速发展,人们对电子产品的要求越来越高,因而电子产品无论从制作上还是从销售上都要求很高。要制作一个应用性比较好的电子产品就离不开高频电路,大到超级计算机、小到袖珍计算器,很多电子设备都有高频电路。高频电路大部分应用于通信领域,信号的发射、传输、接收都离不开高频电路。通信技术在我们的生活中应用广泛,而我们学的是电子信息工程,有一部分涉及的是通信技术,所以对于这次实训,我选择了超外差调频接收机作为实训内容。调频接收机得到最广泛的应用,随着科学技术的发展,出现了超外差式
2、调频接收机。所谓超外差,是指将所要接收的电台在调谐电路里调好以后,经过电路本身的作用,就变成另外一个预先确定好的频率,然后再进行放大与检波。这个固定的频率,是由差频的作用产生的。如果我们在收音机内制造一个振荡电波(通常称为本机振荡),使它与外来高频调幅信号同时送到一个晶体管内混合,这种工作叫做混频。由于晶体管的非线性作用导致混频的结果就会产生一个新的频率,这就是外差作用。采用了这种电路的接收机叫外差式收音机,混频与振荡的工作合称变频。关键词:调频;本振;调制信号;CXA1691BM桂林电子科技大学课程设计(论文)报告用纸第2页共2页Ab
3、stractAlongwiththefastdevelopmentofmodernsociety,peopleofelectronicproductsdemandmoreandmore,sothatelectronicproductsfromtheproductionornomatterfromthesalearedemanding.Tomakeaappliedbetterelectronicproductscannotleavethehighfrequencycircuit,bigtosupercomputer,smalltopock
4、etcalculators,manyelectronicequipmentarehighfrequencycircuit.Highfrequencycircuitmostusedintelecommunicationfield,thelaunchofsignaltransmission,receiving,isinseparablefromthehighfrequencycircuit.Communicationtechnologyinourlifeisusedwidely,andwelearniselectronicandinform
5、ationengineering,anumberofdealswithisthecommunicationtechnology,soforthetraining,IchosethespecializedsuperheterodyneFMreceiverastrainingcontent.FMreceivergetthemostextensiveapplication,withthedevelopmentofscienceandtechnology,theemergenceofaspecializedsuperheterodynetype
6、FMreceiver.Theso-calledspecializedsuperheterodyne,itistopointtowillhavetoreceiveradiotunedcircuitintheadjustedthelater,overtheroleofthecircuititself,theybecomeanotherapredeterminedfrequency,andthenamplifiedanddetection.Thefixedfrequency,isbythedifferencefrequencyroleofge
7、neration.Ifwemakeaoscillationintheradiowaves(oftenknownasthemachineoscillation),makingitandforeignhighfrequencyandamplitudemodulatedsignaltoatransistormixedin,thiskindofworkiscalledfrequencymixing.Becauseofthenonlineareffecttransistorintheresultsofthefrequencymixingcanpr
8、oduceanewfrequency,itisheterodynerole.Adoptedthiscircuitofreceiversthataheterodyneradio,frequencymixing