专业英语的课堂作业.doc

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1、Lesson3Thismicroprocessorhasanaddressbusthatsendsanaddresstomemory,adatabusthatcansenddatatomemoryorreceivedatafrommemory,anRDandWRlinetotellthememorywhetheritwantstosetorgettheaddressedlocation.Comingintotheinstructiondecoderarethebitsfromthetestregisterandtheclockline,aswellasthebitsfr

2、omtheinstructionregister.Withmoretransistors,muchmorepowerfulmultipliercapableofsingle-cyclespeedsbecomepossible.Thetrendinprocessordesignhasbeentowardfiill32-bitALUswithfastfloatingpointprocessorsbuiltinandpipelinedexecutionwithmultipleinstructionstreams.Lesson5Themagnitudeofthetransfer

3、functionisplottedagainstsinFigure5.2b,wheretherealcomponentofs(a)istowardusandthepositiveimaginarypart(jo)istowardtheright.WehaveslicedthefunctionalongthejcoaxisandemphasizedtheRClowpassfilter'sfrequency・responsecurvebyaddingaheavylineforfunctionvaluesalongthepositivejaxis.DecreasingtheQ

4、movesthepolestowardeachother,whereasincreasingtheQmovesthepolesinasemicircleawayfromeachotherandtowardthejcoaxis・Thesepolesmust,however,occurascomplex-conjugatepairs,inwhichtherealpartsareequalandtheimaginarypartshaveoppositesigns.Thisflexibilityinpoleplacementisapowerfultoolandonethatma

5、kesthesecond-orderstageausefulcomponentinmanyswitched-capacitorfilters.Theresultisadoublezeroatinfinity.Lesson6Thesetakethenotionofprocessinggaintotheextremetoachieveveryhighperformance,lowcost,lowpowerdevicesideallysuitedforaudioapplications,withsimpleanaloginterfacing.Thesignalbandwidt

6、hforaGSMcellularchannelis200kH乙ItisnowpossibletoobtainhighspeedADC'swithasamplingrateof80MSPSand14-bitresolution，givingaimpressivemeasured75dBSNRoverthefillI0tofs/2bandwidth.Lesson7Whenthepowerswitchturnsoff,theinputvoltageoftheinductorfliesbelowgroundandisclampedatonediodedropbelowgroun

7、dbythecatchdiode.当断开功率开关时，电感器的输入电压迅速降到零电位以下，并且由钳位二极管固定在零电位以下一个二极管的电压。Thepowerswitchthenturnsoffandtheinductorvoltagefliesbackabovetheinputvoltageandisclampedbytherectifierattheoutputvoltage・然后功率开关断开，电感器的电压回升超过输入电压，并且被整流器钳位/固定在输出电压值。Transformersprovideaneasymethodforadding