应用于12bit50MHz流水线ADC的MDAC的设计-豆柴文库

您所在位置：网站首页 / 应用于12bit50MHz流水线ADC的MDAC的设计.docx / 文档详情

在线预览结束，喜欢就下载吧，查找使用更方便

5 金币

下载文档

/ 2

下载提示

如果您无法下载资料，请参考说明：

1、部分资料下载需要金币，请确保您的账户上有足够的金币

2、已购买过的文档，再次下载不重复扣费

3、资料包下载后请先用软件解压，在使用对应软件打开

文本预览

应用于12bit50MHz流水线ADC的MDAC的设计
Introduction
Modernelectronicsystemsrequirehigh-speedandhigh-precisionanalog-to-digitalconverters(ADCs)toconvertanalogsignalsintothedigitalformforprocessing.ThepipelineADCisapopulararchitectureforhigh-speedconversionwithgoodaccuracy.Toachievehighaccuracy,thepipelineADCrequiresahigh-speed,high-linearity,andhigh-resolutionmagnitudedigital-to-analogconverter(MDAC)asoneofitscriticalcomponents.ThispaperpresentsadesignoftheMDACthatcanbeusedina12bit50MHzpipelineADC.
MDACDesign
TheproposedMDACdesignusesatraditionalop-amp-basedMDACarchitecture.TheMDACconsistsoftwomainstages,amultiplyingdigital-to-analogconverter(MDAC)andanoutputoperationalamplifier(op-amp).TheinputoftheMDACisadigitalcodefromthepipelineADCfront-end,andtheoutputisavoltagethatdrivesthenextstageoftheADC.Toachievehigh-speedsignalprocessing,theMDACneedstohaveafastsettlingtimeandlowdistortion.Thefollowingsectionsdescribethedetaileddesignofthesetwokeycomponents.
MultiplyingDAC
ThemultiplyingDACisthefirststageoftheMDAC,whichconvertsthedigitalcodetoananalogvoltage.ThemajordesignchallengeofthemultiplyingDACistoachievehighlinearityandlowdistortion.Toovercomethischallenge,theMDACusesaparallel-connectedarrayofswitchedcapacitorstoproduceavoltageproportionaltotheinputdigitalcode.Thesimplevoltagedividermethodisusedtocontrolthechargeinjectionofeachcapacitor,whichleadstoaproportionaloutputvoltage.
TheresolutionofthemultiplyingDACisdeterminedbythenumberofcapacitorsinthearray.Inthisdesign,weusea12-bitmultiplyingDACas4096capacitorsinthearray.Eachcapacitorofthearrayisdesignedwithequalvaluestoachievealinearresponse.
OutputOperationalAmplifier
TheoutputoperationalamplifierisusedtoboostthevoltagefromthemultiplyingDACtotherequiredoutputlevel.Theop-ampplaysacrucialroleintheMDACdesignbyprovidingsufficientgainfortheoverallsystem,reducingnoise,andensuringthattheoutputvoltagesettlesaccuratelyandquicklywithinagivensettlingtime.
Theop-ampusedinthisdesignisahigh-gainamplifierwithlowinput-offsetvoltage,lownoise,andh