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1、萬方數(shù)據(jù)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
