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Analysis of Wandering Spur Patterns in a Fractional- $N$ Frequency Synthesizer With a MASH-Based Divider Controller

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The Multi-stAge noise SHaping Digital Delta-Sigma Modulator (MASH DDSM), which is commonly used as a divider controller in a fractional- $N$ frequency synthesizer, can produce a time-varying periodic pattern of… Click to show full abstract

The Multi-stAge noise SHaping Digital Delta-Sigma Modulator (MASH DDSM), which is commonly used as a divider controller in a fractional- $N$ frequency synthesizer, can produce a time-varying periodic pattern of tones in the output spectrum of the synthesizer; these are known as wandering spurs. In this work, a detailed analysis of the cause of wandering spur patterns in a MASH 1-1-1 DDSM-based fractional- $N$ frequency synthesizer, supported by experimental measurements, is presented.

Keywords: synthesizer; tex math; divider controller; inline formula; frequency synthesizer

Journal Title: IEEE Transactions on Circuits and Systems I: Regular Papers
Year Published: 2020

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