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0.25μmCMOS工艺10位100MHz流水线型ADC设计
Introduction:
ADC（Analog-to-DigitalConverter）isanimportantcomponentinmanyelectronicsystems，whichconvertstheanalogsignalsintodigitalsignalsthatcanbeprocesseddigitally.Nowadays,ADCsarewidelyusedincommunication,imageprocessing,instrumentation,andmanyotherfields.However,designinghigh-performanceADCsisstillverychallenging,especiallyindeepsub-micronCMOStechnology.
Inthispaper,wewillpresentadesignofa10-bit100MHzpipelineADCusing0.25μmCMOStechnology.ThepipelineADCarchitectureischosenduetoitshighconversionspeed,moderatecomplexity,andlowpowerconsumption.Thedesignisdiscussedindetail,includingthearchitecture,circuitdesign,simulationresults,andperformanceanalysis.
PipelineADCArchitecture:
ThepipelineADCarchitectureconsistsoftwomajorcomponents,whicharethesample-and-hold(S/H)circuitandthepipelinestages.TheS/Hcircuitsamplestheinputsignalandholdsitduringtheconversionprocess.ThepipelinestagesperformtheactualconversionandconsistofaflashADC,adigitalerrorcorrectionblock,andadigital-to-analogconverter(DAC).
Figure1showstheblockdiagramofthe10-bit100MHzpipelineADC.Theinputsignalisfirstamplifiedandfilteredbyadifferentialamplifier.TheoutputofthedifferentialamplifieristhensampledandheldbytheS/Hcircuit.TheS/HoutputisthenconnectedtotheflashADC,whichisresponsibleforconverting10bitsofresolution.ThedigitaloutputsoftheflashADCareprocessedbythedigitalerrorcorrectionblocktocorrectanyerrorsthatmayhaveoccurredduringtheconversionprocess.ThecorrecteddigitaloutputsarethenfedtotheDAC,whichproducestheanalogoutputsignal.
CircuitDesign:
Inthecircuitdesign,thefocusisonachievinghigh-speed,low-power,andhigh-precisionperformance.Severalcriticalcircuitblocksarediscussedasfollows.
Sample-and-HoldCircuit:
Thesample-and-holdcircuitisthefirstblockintheADCpipelineanditdeterminestheinputsignal’saccuracy.Atypicalimplementationofthesample-and-holdcircuitisthefullydifferentialswitched-capacitorcircuit.Thecircuitconsistsoftwocapacitors,aswitch,andanoperationalamplifier.
Figure2showstheschematic