2010级硕士模拟集成电路分析与设计期末复习题

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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.Higherimmunitytoenviro

2、nmentalnoiseb.Rejectsupplynoisec.Reducecouplednoiseintransmissionlined.Otheradvantages(1).IncreaseoutputswingfromVDD-(VGS-VTH)to2[VDD-(VGS-VTH)](2).Simplerbiasing(3).HigherlinearityDrawback:occupytwicearea3.WhyanalogdesignneededinOpticalReceivers?Highfrequencys

3、ignalsarenotsuitablefortransmittingoverlongdistanceinthetraditionalcableduetothesevereinterferenceandconsiderableattenuationbecauseofthelimitedbandwidthofthecable.Inthiscase,theelectricalhighfrequencysignalsareconvertedintotheopticalsignalsfirstbythelaserdiode,

4、thentheseopticsignalsaretransmittedbyanopticalfiber,whichhasextremelywidebandandverylowloss.Intheotherend,theopticalsignalsareconvertedintoelectricalsignalsagainbythephotodiode.Sincetheelectricalcurrentconvertedbyaphotodiodeisverysmall,thereceiverafterthephotod

5、iodemustprocessalow-levelsignalataveryhighspeed,whichrequiresalownoise,broadbandcircuitdesign.4.Whichtwofiguresplaymostimportantroleintechnologynodesscalingdown?Pleasedescribeindetail.MinimumchannellengthLeff=0.15mmoftenrepresentsthetechnologynodes;Oxidethickne

6、sstox=5nmor50ÅoftenaffectsthethresholdvoltageVt(阈值电压）andthusthepowersupply.Thesetwofiguresplaymostimportantroleintechnologynodesscalingdown.5.IfthereisasmallmismatchbetweenM1andM2,howdotheparametersofthetransistorsaffectthecommonmoderejectionratio(CMRR)ofadiffe

7、rentialpair?6.WritetheinputpoleofthecircuitinFig.1.Fig.17.WhenbothNMOSandPMOSdevicesareneededtobeplacedononechip,whatisneeded?WhenbothNMOSandPMOSdevicesareneededtobeplacedononechip,n-well(n阱）orp-well(p阱)isneeded.8.WhatistheproblemforthecircuitinFig.2?Anysuggest

8、ionstosolveit?Fig.2Problemofabovedifferentialpair:Small-signaldraincurrentofM1is“wasted”Solvemethod:Usedifferentialpairwithactivecurrentmirrortocombinethesmall-signalcurrent