基于过采样技术的ΣΔ音频ADC设计

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1、西南交通大学硕士学位论文基于过采样技术的Σ-Δ音频ADC设计姓名：徐双武申请学位级别：硕士专业：微电子学与固体电子学指导教师：白天蕊20080501西南交通大学硕士研究生学位论文第1I页AbstractAnalogtoDigitalConvertersplayanimportantroleinanever—increasingdigitalworld．∑一AADCmainlyconsistbythe∑一△modulatoranddigitaldecimationfilter，basedonoversamplingandnoiseshapingtechniques，∑jAmodulato

2、rpushesmostofthenoiseenergytbhighfrequenciesoutofthesignalbaseband，thenthenoiseenergyisfilteredbythesubsequentdecimationfilter，therebygaininghighSNRandresolution．∑一△ADCwhichtakesadvantageofthemeritsofmodernVLSItechniquessuchashighspeed，highleveloftheintegrated，lowpowerconsumption，andislesssensit

3、ivetoanalogcircuitnon—idealitiesthanNyquistADC，havebeenappliedinhighresolutionrequirement．occasion．Inthisthesis，adoptingtheTop—Downdesignmethod，formthespec，thepin’Sfunction，systemdesign，modeldesign(circuitdesign／registertransferlevelcode)，thesimulation，thelayout，tothechip’Stest，andcompletethe16b

4、itsaudio∑一AADCdesign．Theresolutionandbandwidthofthe∑一AADCisdeterminedbymodulation，alsothemodulatoristhekeypartyofthe∑一AADC．Theprincipleofthe∑一AADCarediscussedfirstly，thenthebasictheoryandarchitectureofthe∑一AmodulatoriSintroducedindetail，andgiveouthowtodesignthemodulator1ikeasthereparameters．Inor

5、dertomeetthehighresolutionandotherperformancerequirement，threestagesingleloopfullydifferentialswitchedcapacitorarchitecturewiththreebitsquantizerand128OSRisadoptedinthissystemdesign．Thengiveoutdetailofthekeycircuitsofthemodulatorandsimulationresult，suchassamplingswitch，Operationalamplifiers，CMFB

6、，two—phasenon—overlappingclockgeneratorcircuits，bandgapreference，comparator，quantizerandSOon．Thefollowedishowtodesigndigitaldecimationfilter，likeCICfilter，halfbandfilter，FIRfilterandSOon，alsogiveouttherespecificimplementation，thecorrespondingsimulationresultsandsynthesisnetlist．Finally，theback—e

7、ndchipdesignisdiscussed，includingSynthesisbyDesignCompiler，PlaceandRoutebyAstro，STAbyPrimeTime，PostsimulationbyNCSimulatorandchiptest．西南交通大学硕士研究生学位论文第HI页ThischiphasbeenimplementedintheTSMC1P／5M0．18umN-wellCMOSstandardsilicon