宽带微波接收前端分析

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1、ABSTRACTABSTRACTBroadbandmicrowavereceiverfront-endisthekeycomponentofbroadbandmicrowavecommunicationsystem.Broadbandmicrowavereceiverfront-endiswidelyusedinradardetection,UAVreconnaissance,satellitecommunication,electroniccountermeasure,tacticalweaponguidance,microwavemeas

2、urement,civilianradiocommunicationandotherfields.Multi-channeltechnologyisgenerallyusedinthedesignofbroadbandmicrowavereceiverfront-end.First,bandwidthisdividedintoseveralchannels,andthendown-conversionorup-conversionwillbedone.Interferencefrequencycanbesuppressedmoreeasily

3、usingthismethod.Finally,alowIFsignalcanbedemodulated.Atfirst,theoverallprogramwasdesignedaccordingtotheoveralltarget.Theprogramwasdown-conversionafterup-conversion.Thetargetwasdividedintothreeparts,whichareaDC~6GHzlow-passfilter,a2~6GHzbroadbandlownoiseamplifierandabroadban

4、dmixer.Theindicatorsofthethreemicrowavemodulesaredetermined.Negativefeedbacktechnologywasadoptedtodesigna2~6GHzbroadbandlownoiseamplifierwhoseindicatorswereNF<2.5dB,G=25.15±1.75dB，S11<-7.502dB,S22<-7.561dB;Akindofultra-widebandbalunwasusedtodesignamixer;HMC773LC3Bwasusedtod

5、esignedamixermodulewhoseindicatorswereLc<10.33dB，L<30dB,L<30dB，L<8dB；OpenstubstructurewasLORFLOIFRFIFadoptedtodesignaDC~6GHzlow-passfilterwhoseindicatorswereIL<0.5dB，RL>11dBandtherejectionwasgreaterthan50dBfrom10.5GHzto20GHz；Thesystemindicatorsofthefront-endwereNF<2.5dB,

6、DR=50.36dBc,SFDR=44.36dBc,S=-70.36dBm,IIP3>-8.1dBm.Firstly,thecorecharacteristicofthethesiswasthein-depthstudyonnegativefeedbacktechnologyforengineeringapplication.Negativefeedbacktechnologycanmatchportimpedanceto50Ohm,canimprovethegainathighfrequencyandcansignificantlyimpr

7、ovestability.AlargenumberofsimulationwasdoneusingADS.Alownoiseamplifierhadbeendevelopedwhichhadlownoisefigure,flatgain,andsimplestructure.Secondly,extensivedebuggingwasdoneusingHFSS.Eventually,aII万方数据ABSTRACTbroadbandbalunwithhighermagnitudecoherenceandphasecoherencehadbeen

8、developed.Thirdly,afilterwhosestop-bandwasupto20GHzhadbeendesigned.Finally,thesyst