low-power cmos vco with a low-current, high-q active inductor

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1、www.ietdl.orgPublishedinIETMicrowaves,Antennas&PropagationReceivedon18thJuly2011Revisedon3rdJanuary2012doi:10.1049/iet-map.2011.0332ISSN1751-8725Low-powerCMOSVCOwithalow-current,high-QactiveinductorY.-J.JeongY.-M.KimH.-J.ChangT.-Y.YunDepartmentofElectronicandComputerEngineering,Han

2、yangUniversity,Seoul133-791,KoreaE-mail:taeyeoul@hanyang.ac.krAbstract:Thisstudydescribesanactiveinductor(AI)designedtoreducepowerconsumptionandtoimprovethequalityfactor.Forthesepurposes,oneofthetransistorsfortheAIoperatesinthesubthresholdregion,andtheAIusestheadditivecapacitor(AC)

3、technique.TheproposedAIwasappliedtoavoltagecontrolledoscillator(VCO)todemonstratetheenhancementinpowerconsumptionandimprovementinphasenoise.TheAI-VCOswithandwithoutACwerefabricatedusinga0.18mmCMOSprocessandachievedfrequencytuningrangesfrom1.13to2.67GHzand1.3to3.24GHz,respectively.T

4、hemeasuredphasenoiseoftheAI-VCOwithACis292.2dBc/Hzat1MHzoffset,a4dBimprovementcomparedtothatoftheAI-VCOwithoutAC.The2proposedVCOconsumes2.2–13mWwitha1.8Vvoltagesupplyandoccupies171×174mmofcoresizewithouttestingpads.1Introductionfeedbackresistor(Rf)andanadditivecapacitor(Ca).Thetran

5、sistorsM1andM2formafeedbackloopbasedontheLargevalueandhigh-quality(Q)factorinductorsplayacriticalgyratortheory,accordingtowhichseveraltotensofnHofroleinthedevelopmentoflow-powerwirelesstransceivers[1].inductancearegeneratedwithinafewGHzregioninaveryInacontemporarytransceiver,theon-

6、chipinductoristypicallysmallareacomparedtothatofthespiralinductor.Theimplementedwithspiralturns.SpiralinductorshaveasmallcurrentsourcesI1andI2controltheinductancevalueandinductancevalueperunitareaandlowQbecauseoflossesthepowerconsumptionoftheAI.ThefeedbackresistorRfinthelongspiralc

7、onductorandthesubstrate.isinsertedbetweenthedrainofM1andthegateofM2toRecently,thecomplementarymetaloxidesemiconductorimprovetheQoftheAI[9].TheadditionofCabetween(CMOS)activeinductor(AI)hasattractedattentioninthedrainofM1andRfisproposedforQimprovementtoCMOSwirelesscommunicationsyste

8、ms.Itswell-knowncompensate