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ID:31953994
大小:5.33 MB
页数:52页
时间:2019-01-29
《vhf跳频电台发射机射频前端-研究与实现》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、万方数据AbstractWiththeuniversalapplicationofmicroelectronictechnologytomodemwars,microelectronicconfrontationtechnologybecomesthemostimportantmeallStodecidewhowillwintheWar,andtheradiocommunicationconfrontationtechnologyisthenucleusofcommanding,controlling,communicationandinformationconfrontat
2、ionsystem.EspeciallyinthecaseoftheregionalwarsthattheUnitedStatesarmywasinvolvedin,ithasarousedspecialattentionfromdifferentgovernmentsandarmies,whoarewillingtoinvestlargeamountsofmoneyandhumanresourcesinconductingresearchonelectronicconfrontationtechnology,especiallyFHSS.FHSSiswidelyapplie
3、dinmilitarycommunicationfieldbecauseofitsstronganti—interference,anti-jammingandanti—interceptionability.AstheRFfront-endofFHSS,thedevelopmentoftheradioreceivertendstowardshi曲performanceandhighintegration.Modemradioreceiverisinpursuitoflargedynamicrange,goodlinearity,highsensitivity,bettera
4、daptabilityandstronganti-interferenceabilityandSOon.Thatextremelypromotesthedevelopmentofthereceiver.AlsotheserequirementsalsopromotedtheVHFfrequencyhoppingradioreceiveradvances.ThisworkwassupportedbytheNo.50ResearchInstituteofChinaElectronicsTechnologyGroupCorporationunderProjectthenewgene
5、rationofVHFfrequencyhoppingradioproject.Theauthorwasresponsibleforimplementationradioreceiverfront—end.Thereceiverfront-endrequiresthatthereceiveristoachievehi【ghselectivity,largedynamicrange,stronganti-interference,andexcellentadaptability,usingatwostageamplifiertoimproveprofits.Thedriving
6、amplifierisimplementedbythepoweramplifierchipBLF404producedbytheNXPCompany,andtheendoftheamplifierusesthepowerchipBLF245BfromtheNXPCompany.Besidesconsideringthelinearity,wealsoneedtotrytoimproveworkefficiency,SOwechoosetheclassAB,andadoptthepush-pullstructuret0designthebroadband,reasonablyt
7、akingthesetwoindicators~boththeiinearityandefficiency---intoconsideration,Onthebasisofthis,thetubeamplifierBLF245BisusedWi吐lreducingvoltage.Onthepremiseofguaranteeingthelinearindicators,ithelpstogreatlyimprovetheworkefficiency.Beforethedrivingstageandaft
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