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需打印2428IEEEJOURNALOFSOLID-STATECIRCUITS,VOL.40,NO.12,DECEMBER2005ALow-PowerMulti-BitModulatorin90-nmDigitalCMOSWithoutDEMJiangYu,Member,IEEE,andFrancoMaloberti,Fellow,IEEEAbstract―Multi-bitsigma-deltamodulatorsarewidelyusedinanalog-to-digitalconversionespeciallyinthemoderndeep-submicronCMOSprocess.Asthequantizerresolutionofmodulatorsincreases,theSNRperformanceimproves.However,thefeedbackDAChastomaintainhighlinearity.Thegeneralpracticetoachievethatistousedynamicelementmatching(DEM).ThemethodologyproposedinthispaperwillgreatlyreducethecomplexityorevenavoidusageofDEMformulti-bitmodulators.Theproposedmethodology―truncationerrorshapingandcancellation―reducesthefeedbackDAClevelsformult……