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1、Howtoselectamixer__________________________________________________________________________________Selectthepropermixerforyourneeds.Therearehundredsofmodelsavailable.Under-specifyandfacemarginalperformance,over-specifyandpayformorethanyouneed.Here'stheproperapproach.Mixers
2、areabundantinelectronicsystemsrangingfrominexpensiveconsumerproductstosophisticatedmilitaryhardware.You'llfindtheminentertainmentequipmentaswellascommunicationsgear,testinstruments,radarunitsandcountermeasuresystems.Mini-Circuitsoffersover400differentoff-the-shelfmixermode
3、lswiththousandsofvariationsavailable.Differentconnectorconfigurations,tighterspecs,andreliabilitytestingareavailableonrequest.Non-optimummixerselectionbearsapenalty:under-specifyandfacemarginalperformance;over-specifyandpayextraforunnecessaryperformancecharacteristics.Maki
4、ngtherightchoiceSimplystated,therearethreebasicsteps:(1)Decidingonasurface-mount,connector,orplug-inversion.(2)Selectingthemixer“Level”,whichistheLO(localoscillator)drivepowerindBmrequiredfortheapplication.(3)Pickingamodelthatextendsoverthefrequencyrangeinvolved.Thesequenc
5、eofthesestepsfollowsthemannerinwhichmixerinformationisaccessedwhenselecting“FrequencyMixers”intheProductSelectionmenuontheMini-Circuitwebsite.Ageneralpresentationwillbegivenforeachofthesesteps,andthenpertinenttechnicalconsiderationswillbediscussedinmoredetail.Atthestartiti
6、simportanttounderstandyourspecificneeds,soitisstronglyrecommendedthatyouorganizetherequirementsforyourapplicationandputtheminwriting.Ascertainwhatfrequencyranges(LO,RF,andIF)areinvolved,andtheLOdriveyouhaveavailable.Someapplicationsmightspecifyotherfactors,suchastheaccepta
7、bleamountofharmonicdistortion(causedbymixingofLOandsingle-toneRFharmonics)and/ortwo-tone,third-orderintermodulation(IM)distortion.I.DETERMINETHETYPEOFPACKAGEANDCONNECTIONS:SURFACE-MOUNT,PLUG-IN,ORWITHCOAXIALCONNECTORS.Generally,theuserhasevaluatedthesystemrequirementsandwi
8、llknowbeforehandwhetherthemixeristobemountedontheuser’sPCboardorneedstohavecoaxialconnect
