cmos programmable gain amplifier with a novel dc-offset cancellation technique

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1、ACMOSProgrammableGainAmplifierwithaNovelDC-offsetCancellationTechniqueXiaojieChu,MinLin,ZhengGong,YinShiFaFosterDaiSuzhou-CASSemiconductorsIntegrated-DepartmentofElectrical&ComputerEngineeringTechnologyResearchCenterAuburnUniversitySuzhou,Jiangsu,215021,P.R.ChinaAuburnAlabama,36849-5201,USAAbstract-

2、Aprogrammablegainamplifier(PGA)withanovelDCoffsetcancellation(DCOC)techniqueforIEEE802.11b/gwirelessLANdirect-conversionreceiver(DCR)ispresented.Anoperationalamplifier(OPAMP)utilizinganimprovedMillercompensationapproachisadoptedinthisPGAdesign.Againtuningrangeof0dBto56dBwith2dBperstepisachieved.TheD

3、COCloopisbasedonavoltage-currentnegativefeedbackthatincludesaswitchablebandwidthalgorithmtospeedupthesettlingtimeofDCOC.TheproposedapproachrequiresnoexternalcomponentsanddemonstratesexcellentDCOCcapabilityinmeasurement.Fabricatedina0.13mCMOStechnology,thisPGAdissipates9.7mWfroma1.2VsupplyFig.1.Bloc

4、kdiagramofthedirect-conversionreceiver2voltageandoccupiesanareaof0.17mm.loopgainatthedownconvertedsignalbandsuchas10MHzI.INTRODUCTIONandkeepstableatthesametime.Furthermore,theproposedDCOCtechniqueovercomesthedrawbacksofACcouplingInrecentyears,directconversionhasbecomethemostanddigitalsolution.Thisne

5、wtechniquerequiresnoexternalpopulararchitectureofreceiversduetoitslowerpowercomponentsandoccupiesasmallarea.Withoutcomplicatingconsumption,lowercomplexityandfullymonolithicthedesignorincreasingpowerconsumptiongreatly,theintegrationcapabilitycomparingwithsuper-heterodyneproposedtechniquedemonstratesg

6、oodDCoffsetcancellationcounterparts.Nevertheless,directconversionentailssomecapability.Bothsignalintegrityandfastsettlingareachieveddesignchallengesthatdonotexistinheterodyneduetotheuseofaswitchablebandwidthalgorithm.architectures.TheseissuesareDCoffset,I/Qmismatch,Thispaperisorganizedasfollows.Firs

7、tly,circuitanalysisflickernoise,even-orderdistortionandlocaloscillator(LO)anddesignoftheproposedPGAispresentedinsectionII.leakage.Amongthem,DCoffsetisthemostdetrimentalSecondly,experimentalresultsareg