一种应用于中频数字化接收的连续离散时间混合结构带通Σ-Δ ADC.docx 立即下载
2024-12-04
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一种应用于中频数字化接收的连续离散时间混合结构带通Σ-Δ ADC.docx

一种应用于中频数字化接收的连续离散时间混合结构带通Σ-ΔADC.docx

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一种应用于中频数字化接收的连续离散时间混合结构带通Σ-ΔADC
Title:ContinuousDiscrete-TimeHybridStructureBandpassΣ-ΔADCforApplicationinIntermediateFrequencyDigitalReceivers
Abstract:
Inthispaper,weproposeacontinuous-discretetimehybridstructurebandpassΣ-ΔADC(analog-to-digitalconverter)forapplicationinintermediatefrequency(IF)digitalreceivers.TheproposedADCarchitecturecombinestheadvantagesofbothcontinuous-timeanddiscrete-timeΣ-Δmodulationtechniques,leadingtoimprovedperformanceintermsofsignal-to-noiseratio(SNR)andresolution.ThedesignandsimulationresultsdemonstratetheeffectivenessoftheproposedADCinachievinghigh-speedandhigh-accuracyconversioninIFdigitalreceivers.
1.Introduction
Digitalreceivershavegainedsignificantpopularityduetotheirflexibility,reconfigurability,andimprovedperformance.InIFdigitalreceiversystems,theADCplaysacrucialroleindigitizingthereceivedanalogIFsignal.BandpassΣ-ΔADCsareoftenusedinsuchsystemstoachievehigherresolutionandhigherdynamicrange.However,theconventionalarchitecturesofΣ-ΔADCshavelimitationsintermsofimplementationcomplexityandpowerconsumption.Therefore,thereisaneedforanovelarchitecturethataddressesthesechallenges.Inthispaper,weproposeacontinuous-discretetimehybridstructurebandpassΣ-ΔADCtomeettheserequirements.
2.Continuous-DiscreteTimeHybridStructure
ThehybridstructureoftheproposedADCcombinesacontinuous-timebandpassfront-endandadiscrete-timeΣ-Δmodulator.Thecontinuous-timefront-endisresponsibleforfilteringandamplifyingtheinputsignal,reducingthequantizationnoiseattheinputoftheΣ-Δmodulator.Thediscrete-timeΣ-Δmodulatorthentakesoverthedigitizationprocess,providinghigh-resolutionconversionwithlowquantizationnoise.
3.ArchitectureandOperation
ThearchitectureoftheproposedbandpassΣ-ΔADCconsistsofacontinuous-timebandpassfilterfollowedbyadiscrete-timeΣ-Δmodulator.Thebandpassfilterisimplementedusingactive-RC(resistor-capacitor)filterwithintegratedoperationalamplifiers.TheΣ-Δmodulatorisimplementedusingacascadeofintegratorsandquantizers,whereinthequantizerperformsthedigitizationofthesign
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