COMPARISON OF SIGMA-DELTA MODULATOR FOR FRACTIONAL-N PLL FREQUENCY SYNTHESIZER-中国期刊网

摘要 ThispaperinvestigatesthedesignofdigitalSigma-DeltaModulator(SDM)forfractional-Nfrequencysynthesizer.CharacteristicsofSDMsarecomparedthroughtheoryanalysisandsimulation.Thecurveofmaximum-loop-bandwidthvs.maximum-phase-noiseissuggestedtobeanewcriteriontotheperformanceofSDM,whichgreatlyhelpsdesignerstoselectanappropriateSDMstructuretomeettheirrealapplicationrequirementsandtoreducethecostaslowaspossible.Alow-spur3-orderMul-tistageNoiseShaping(MASH)-1-1-1SDMusingthree2-bitfirst-ordercascadedmodulatorsisproposed,whichbalancestherequirementsoftone-freeandmaximumoperationfrequency.

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COMPARISON OF SIGMA-DELTA MODULATOR FOR FRACTIONAL-N PLL FREQUENCY SYNTHESIZER

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COMPARISON OF SIGMA-DELTA MODULATOR FOR FRACTIONAL-N PLL FREQUENCY SYNTHESIZER

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