标签: direct-conversion

Direct-ConversionWirelessTransceiversforDigitalCommunication(byAbidi)IEEEJOURNALOFSOLID-STATECIRCUITS,VOL30,NO12,DECEMBER19951399Direct-ConversionRadioTransceiversforDigitalCommunicationsAsadA.Abidi,SeniorMember,IEEEAbstract-Direct-conversionisanalternativewirelessreceiverarchitecturetothewell-establishedsuperheterodyne,particularlyforhighlyintegrated,low-powerterminals.Itsfundamentaladvantageisthatthereceivedsignalisamplifiedandfilteredatbasebandratherthanatsomehighintermediatefrequency.Thismeanslowercurrentdrainintheamplifiersandactivefiltersandasimplertaskofimage-rejection.Thereisconsiderableinteresttouseitindigitalcellulartelephonesandminiatureradiomessagingsystems.Thispaperbrieflycoverscasestudiesintheuseofdirect-conversionreceiversandtransmit……

ACMOSChannel-SelectFilterforaDirect-ConversionWirelesThispaperwaspresentedattheSymposiumonVLSICircuits,Honolulu,June13-15,1996.Itappearsonpages62-63oftheconferenceproceedings.ACMOSChannel-SelectFilterforaDirect-ConversionWirelessReceiverP.J.Chang,A.Rofougaran,andA.A.AbidiElectricalEngineeringDepartmentUniversityofCaliforniaLosAngeles,CA90095-1594Introduction&SpecificationsWhereasnoiseandnonlinearityintheRFfront-enddeterminethesensitivityofawirelessreceiver,thefilterswhollygovernitsselectivity―thatis,itsabilitytopickoutasignalofinterestinafrequencyband,whilerejectingalltheothernearbysignalspopulatingthatband.Filtering,likeamplification,buildsprogressivelyinthereceiver.TheRFpreselectfilterattenuatestheimagetothedesiredchannel,……