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1、1236IEEETRANSACTIONSONCIRCUITSANDSYSTEMSI:REGULARPAPERS,VOL.54,NO.6,JUNE2007BehavioralModelingMethodsforSwitched-Capacitor61ModulatorsGeorgeSuárez,Member,IEEE,ManuelJiménez,Member,IEEE,andFélixO.Fernández,StudentMember,IEEEAbstract—SigmadeltaModulator
2、s(61Ms)arecorner-stoneelementsinoversampledanalog-to-digitalconvertersanddigital-to-analogconverters(DACs).Althoughtransistor-levelsimulationisthemostaccurateapproachknownforthesecom-ponents,thismethodbecomesimpracticalforcomplexsystemsduetoitslongcom
3、putationaltimerequirements.BehavioralFig.1.OTAmodel.modelinghasbecomeaviablesolutiontothisproblem.Inthispaper,westudystylesandissuesintheaccuratemodelingoflow-power,high-speed61Msandintroducetwonewbehavioralmodelsforswitched-capacitor(SC)integrators.T
4、hefirstmodelaspromisingcandidatesforhigh-speed,high-resolution,andisbasedontheSCintegratortransientresponse,includingthelow-powermixed-signalinterfaces.effectsoftheamplifiertransconductance,outputconductance,andthedynamiccapacitiveloadingeffectonthesett
5、lingtime.ModelingandsimulationarefundamentalstepsinthedesignThesecondmodelisbasedonasymbolicnodeadmittancematrixcycleof.Despitethis,onlyafewmodulatorarchitec-representationofthesystem.Nonidealitiessuchasjitter,thermaltureshavebeenfullyanalyzed.Amajorh
6、indranceisthatana-noise,andDACmismatcharealsoaddressedandincludedinalyticalexpressionsformodulatorbehaviorandperformancearedual-band,GSM/WCDMA,second-order,multibit61Mmodelgenerallyunavailable.Evenwhenananalyticalmodelofthede-withindividuallevelaverag
7、ing.VHDL-AMSandMATLABSimulinkwereusedasmodelinglanguages.Bothmodelsaresiredtopologybecomesavailable,simulationmightstillbenec-validatedagainstexperimentaldata,showingcompetitiveresultsessarytoobtainaccurateresults[1].Device-levelsimulationofinthesigna
8、l-to-noise-plus-distortionratio.Acomparativeanalysisthesecomponents,althoughaccurate,becomesprohibitiveforbetweentheproposedandatraditionalmodelispresented,withcomplexsystemsduetoitslongrunningtimes.Forthisreason,emphasisonthedegradingeffectsd
