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1、DDS的杂散分析及降低杂散的方法30??Y??P2?g2007??4?iY?Y?Y??)??????ChineseJournalOfElectronDevicesY?Y?Vol.30Y?No.2Apr.2007SpuriousSignalsAnalysisofDirectDigitalFrequencySynthesizerandSpurReductionTechniquesLIULan2kun,PANMing2hai(CollegeofInfo.Sci.&Engi.,YanshanUniversity,
2、QinhuangdaoHebei066004,China)Abstract:ThespurioussignalsinDDSgeneratedbyphase2truncation,amplitude2truncationandthedigital2to2ana2logconversionsareanalyzed,andtheirfrequencyspectracharactersanddistributingrulesarestudied.Theconclu2sionpresentsphasetruncationi
3、sthecriticalsourceofspurioussignalsspectruminDDS.Anewmethodselectingtheclockfrequencycorrectlyisproposed.Itisusedtoeliminatespurcausedbyphasetruncation.Thentheauthorpresentsaschemeofconcatenationstructuretoreducespursofoutputsignalindesigningproject.Finally,t
4、hecomputersimulationindicatesthattheschemeisfeasibility.Keywords:directdigitalfrequencysynthesis;spurioussignalsreduction;phase2truncation;concatenationEEACC:7220DDS???]???C?????????]?????????v????,???u??(?????L???????????u???s????,???D??????066004)?:?5???g62
5、626???4?????v????(82),?m,?I???????E???g,?;???E?????l?K???g???_?????????7?C????,@y;???u??(62),?m,????,?;???E?????l?K???g???_?????????7?C?????E??;???????L???F???t?s?;???)?D???????????7?C?????u???????a?E??;?.???u?????????7?????g???&?E??,@??Y???:?????????????
6、??i?a??(DDS)???????k???]??Y3?B?????t?]?????????L?]???????Q???????C?2???????_?????L?C??,???Y?????k???&DDS???????Q?]?????;??????.?U?I???Y?????????????i?C?n????????????????,?I?????:DDS?????????M???????k???]??,?:?u??????DDS??????????????,?I???????????????MDDS
7、???????????]??,???u???_???????K???g,???????P???????????_?L.???(??:?????????????i?a;?????]??;?????k??;?????M???C????:TN74Y?Y????(?h???3:AY?Y??????t??:100529490(2007)0220572203Y?Y??????????????i?a(DDS)?&?????????g???????????????????i?a???&[1],DDS???n???
8、????????g????Y3?????C??????Y3??????????Y3?????b??????Y3?f?????????????????.???2?:?x???.?v??,????DDS???n???E?????I????.?-?&,DDS?????t?????????n????,???????????????Q?]?????L,???J?????Y?
