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ID:18603239
大小:1.12 MB
页数:13页
时间:2018-09-19
《2010级硕士模拟集成电路分析与设计期末复习题》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、2010级研究生《模拟集成电路分析与设计》复习一、Questions:1.Whatistheproblemofsimpledifferentialcircuit?Howtosolvethisproblem?IfVin,CMislow,outputwillbeclipped.(失真)2.Describeadvantagesanddrawbacksofdifferentialsignalscomparingwithsingle-endedsignal.Advantages:a.Higherimmunitytoenvironmentalnoiseb.Re
2、jectsupplynoisec.Reducecouplednoiseintransmissionlined.Otheradvantages(1).IncreaseoutputswingfromVDD-(VGS-VTH)to2[VDD-(VGS-VTH)](2).Simplerbiasing(3).HigherlinearityDrawback:occupytwicearea3.WhyanalogdesignneededinOpticalReceivers?Highfrequencysignalsarenotsuitablefortransmitt
3、ingoverlongdistanceinthetraditionalcableduetothesevereinterferenceandconsiderableattenuationbecauseofthelimitedbandwidthofthecable.Inthiscase,theelectricalhighfrequencysignalsareconvertedintotheopticalsignalsfirstbythelaserdiode,thentheseopticsignalsaretransmittedbyanopticalfi
4、ber,whichhasextremelywidebandandverylowloss.Intheotherend,theopticalsignalsareconvertedintoelectricalsignalsagainbythephotodiode.Sincetheelectricalcurrentconvertedbyaphotodiodeisverysmall,thereceiverafterthephotodiodemustprocessalow-levelsignalataveryhighspeed,whichrequiresalo
5、wnoise,broadbandcircuitdesign.4.Whichtwofiguresplaymostimportantroleintechnologynodesscalingdown?Pleasedescribeindetail.MinimumchannellengthLeff=0.15mmoftenrepresentsthetechnologynodes;Oxidethicknesstox=5nmor50ÅoftenaffectsthethresholdvoltageVt(阈值电压)andthusthepowersupply.These
6、twofiguresplaymostimportantroleintechnologynodesscalingdown.5.IfthereisasmallmismatchbetweenM1andM2,howdotheparametersofthetransistorsaffectthecommonmoderejectionratio(CMRR)ofadifferentialpair?6.WritetheinputpoleofthecircuitinFig.1.Fig.17.WhenbothNMOSandPMOSdevicesareneededtob
7、eplacedononechip,whatisneeded?WhenbothNMOSandPMOSdevicesareneededtobeplacedononechip,n-well(n阱)orp-well(p阱)isneeded.8.WhatistheproblemforthecircuitinFig.2?Anysuggestionstosolveit?Fig.2Problemofabovedifferentialpair:Small-signaldraincurrentofM1is“wasted”Solvemethod:Usedifferent
8、ialpairwithactivecurrentmirrortocombinethesmall-signalcurrent
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