Quadrature Subharmonic Coupled Oscillators for a 60GHz SiGe.pdf

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1、822QuadratureSubharmonicCoupledOscillatorsfora60GHzSiGeScalablePhasedArrayJamesF.Buckwalter,AydinBabakhani,AbbasKomijani,andAliHajimiriCaliforniaInstituteofTechnology,Pasadena,CA91125Abstract-ThispaperdescribesanintegratedcoupledoscillatorarrayinSiGeformillimeterwaveappl

2、ications.Thedesignfocusesonscalableradioarchitectureswheremultiplediesaretiledtoformlargerarrays.A2x2oscillatorarrayfora60GHztransmitterisdesignedwithintegratedpoweramplifiersandantennas.The2x2arraydemonstratesa200MHzlockingrangeand1x4arrayformedbytwoadjacentchipshasa60M

3、Hzlockingrange.Thephasenoiseofthearrayisbelow-llOdBc/HzatalMHzoffset.IndexTerms-PhasedArray,CoupledOscillator,MillimeterWave,SiliconGermanium.I.INTRODUCTIONUnlicensedoperationatthe59-65GHzbandisstimulat-inguniqueradioarchitecturesformillimeterwaveinte-gratedcircuits.Tran

4、sceivercircuitsthatoperateatDie3~~J11L~~.I{iDie4millimeterwavefrequenciesweredemonstratedwithSiGeFig.1.Coupledoscillatorapproachforfullyintegratedphased-[1][2].However,theintegrationofacompletephasedarrayarraytransmitter.Eachoscillatordrivesatransmitchainwithatransceiver

5、withantennasonasinglechipoffersnewDACcontrolledphaseshifter,poweramplifierandantenna.designchoicesandopportunities.Thispaperdemonstratesacoupledoscillatorarrayformillimeterwavesiliconinte-Thedesignofthecoupledoscillatornetworkismotivatedgratedcircuits.bydemonstratingarra

6、yscalabilityaswellasavoidingtheCoupledoscillatorsaresuitedforfullyintegratedphasedon-chipcouplingthatoccurswithpower-amplifiersandarraycircuits.First,thesmallwavelengthat60GHzallowsantennas.Themeasuredresultsshowthatthephasenoisefullyintegratedarraysonasingledie.Scalable

7、architec-ofeachelementcanbesuppressedwhenlockedtoanturesareparticularlyappropriateforcreatinglargerarraysexternalarrayacrossasinglechipaswellasacrosstwobytilingseveraldies.InFig.1,scalabilityisdemonstratedchips.foraphasedarraytransmitter.Thephasedarrayrequiresphasecohere

8、ncebetweenallelements.Sinceeachchiprequiresfrequencygeneration,neighboringchipsareII.COUPLEDOSCILLATORS