1、華中科技大學(xué)碩士學(xué)位論文用于時(shí)鐘芯片的高性能晶體振蕩器的設(shè)計(jì)姓名：朱鐘琦申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：軟件工程指導(dǎo)教師：鄒雪城20090525華中科技大學(xué)碩士學(xué)位論文華中科技大學(xué)碩士學(xué)位論文IIAbstractCrystaloscillatisanintegralpartofradiofrequencydigitaldevices.WiththehighQofanelectromechanicalquartzcrystalasthefrequ

2、encyingcomponentthecrystaloscillathasveryhighfrequencystabilitylowphasenoiseprovidingveryaccuracyclocksignalreference.Inthispaperfirstlythemultisourcesclocksystemfawirelesssenswkschipisdescribed.Withthissystemwritergives

3、theSpecificationsofa32.768kHzquartzcrystaloscillat.Thenthetheyoftheconditionofreliablestartupoftheoscillationtheautomaticgaincontrolledfeedbackloopisdeeplyconcerned.Withthisthey，writerproposedanewconstructionofelectricci

4、rcuitwithtwomodetransfm，madesomeadvicesinthedesignofthefaststart–uplowpowercrystaloscillatcircuit.Atlasttheanalysisdesignofafaststart–uplowpower32.768kHzcrystaloscillatcircuitwithautomaticgaincontrolledfeedbackloopasthea

5、mplitudelimitingtechniqueisperfmed.ThiscircuitisverysuitablefCMOSintegratedcircuittechnology.Thetestingresultsshowsthattheperfmanceofthefaststart–uplowpowercrystaloscillatmeetsthesystemdems，ithasaveryshtstartuptimelowpow

6、er.ThecrystaloscillatisfabricatedintheHuaHongNEC0.25mCMOSprocess.Basedonsimplecircuitmodeltheroughvalueofoscillatcircuitcomponentisachieved.FurtherbytakingtheadvantagesofEDAcircuitdesignsoftwaresuchasSpectralAdvancedDesi

7、gnSystem(ADS)inCadencetheaccuratevalueofoscillatcircuitcomponentisachieved.ThelayoutdesigntoolisVirtuosinCadence.Thesimulationresultsobtainedshowthatthefunctionsperfmancesofthiscrystaloscillatmeetthespecwell.Keywds:Cryst