Clock and Data Recovery for a 6 Gbps SerDes Receiver.pdf

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1、ClockandDataRecoveryfora6GbpsSerDesReceiverJayeshPatilLiliHeMorrisJonesDepartmentofElectricalEngineeringDepartmentofElectricalEngineeringDepartmentofElectricalEngineeringSanJoseStateUniversitySanJoseStateUniversitySanJoseStateUniversitySanJose,USASanJose,USASanJose,USAjayesh147@gmail.comlili_he@sbc

2、global.netmorris.sjsu@comcast.netAbstract—Thispaperpresentsthedesignandimplementationofa6Gbpsclockanddatarecovery(CDR)systemforSerialAdvancedTechnologyAttachment(SATA)standard.TheCDRincorporateshalfratephasedetectorandisrealizedusinga2loopPLLconsistingofacoarseloopandafineloop.Fastfrequencyacquisit

3、ionisacquiredthroughcoarseloopandfinephasealignmentisperformedthroughahalfratefineloop.Figure1.SerDesTransceiverblockdiagramWhilethecoarseloopcanrecoverclockrangingfrom2.5GHzto3.2GHzthefineloophasanacquisitionrangeof200KHz.ThedesignhasbeenimplementedinIBM0.13umCMOSThesenderwhichcanbearouter,CPU,I/O

4、chip,etctechnology.VerilogAMSandMatlabwereusedforfrontendsendsparalleldatatothetransmitter.TheparalleldataisdesignandCadenceforschematicandlayoutimplementation.thenmultiplexed(MUX)bythetransmitterandconvertedtoTheoverallsiliconareaoftheCDRisapproximately108X2aserialdatastream[1].Atthereceiverendthi

5、sserialdatais244umexcludingloopfiltercapacitors.recoveredbyaclockanddatarecoverycircuitpresentintheDeserializerandagaindemultiplexed(DEMUX)intotheKeywords-Clockrecovery,half-rateCDR,SerialATAcommunication,oscillators,phasedetectors,PLLs,Comparatororiginalparalleldatastream.TheMUX-DEMUXperformsthepa

6、ralleltoserialattransmitterandserialtoparallelatreceiverconversion.TheMUX-DEMUXshouldbeI.INTRODUCTIONsynchronizedtosystemclockwhichisahighfrequencyThedemandforhighdatarateandhigherclockclockgeneratedfromaPhaseLockedloop[1].frequencieshasgrownsteadilyoverthepastdecade.CommunicationnetworkssuchasEthe

7、rnet,SONET/SDH,ATM,SATArequirehigherbandwidthandgreaterefficiencytosupportitsgrowingtraffic.Parallelinterconnectsfailedtoservethiseverincreasingbandwidthrequirementmainlyduetothelengthoftheinterconnectwire,