8位電流模模數轉換器設計研究.pdf

1、西安電子科技大學碩士學位論文8位電流模模數轉換器設計研究姓名：李發(fā)寧申請學位級別：碩士專業(yè)：微電子學與固體電子學指導教師：張鶴鳴200501012AbstractAnewcurrentmodeA／DconverterAnalogtoDigitalConverterispresentedinthispaper，basedonaParallel(flash)andPipelinedA／DConverterw曲therapiddevelopm

2、entofcomputer，signalprocessandmicroelectronictechnology，newandadvancedelectronsystemcomesfornllargelyInthepasttwentyyearsdigitalICdevelopmentimprovessignalprocessabilityThissystemsarebeusedforcontinuoustimesignal，includi

3、ngvideo，voice，medicineimaging，radar，instrument，consumedelectricalappliance，andlong—distancecommunicationSOonTheirsuccessfuluseattributetotherapiddevelopmentofADC(Itcanconvertcontinuoussignaltodigitalsignal，whichisdiscret

4、eandbinarysystemAtthesam_etime，theoutputofADCisconvenientforaccurateandhighspeeddigitalsignalprocess)Inageneralway，accordingtodifferentrequestofdigitalsignal，thecircuitstructure，resolution，sampleandconversionrateoftheADC

5、isalsodifferentComparedallkindsofADCstructure，advantageanddisadvantage，flashandpipelinedslauctureisusedThestructurecombinesadvantagesofthetwomethods，whicharellighconversionrateandhighresolutionAtthesametime，currentmodeap

6、proachisusedforreducingpowerSothismethodisadvisable，consideredmanyfactorsTheprincipleofthecircuitsarestated：firstly，realize4bitcurrentmodeflashADC，thedigitalresultissenttoDAC，thensubtractedbyinputcurrent，passcurrentampli

7、fier，atlastgettosubsequent4bitflashADCItsresultandhigh4bitdigitaloutputarewholeoutputof8bitADCTheADCincludescurrentmirror，currentreference，currentcomparators，currentamplifierandDACSOonThecircuitsusefullcustomdesignmethod

8、frombasiccircuitcelltockcuitsystemBecauseofuseofcurrentmodeapproach，theADCcircuitstructureisnovelandsimple，withoutsubtracterandsampleholdckcuitsSothepowerisreducedlargelyTheA／Dconverterneedsafewcurrentreferenceandcurrent

9、comparatorsTheA／DcircuitdesignBSeSmputmethodofthecircuitschematicdiagramCadenceCADtoolsareusedtosimulateandverifytheADCfunctionandperformancewithstandard06umCMOStechnologyofWuxiCSMCHJSemiconductorCoLtdThesimulatedresults