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

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

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...

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Veröffentlicht in:IEEE transactions on circuits and systems. I, Regular papers Regular papers, 2020-03, Vol.67 (3), p.729-742
Hauptverfasser: Mai, Dawei, Kennedy, Michael Peter
Format: Artikel
Sprache:eng
Schlagworte:
Delta-sigma modulation
Fractional-<italic xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">N frequency synthesizers
Frequency measurement
Frequency synthesizers
MASH DDSM divider controller
Multi-stage noise shaping
nonlinearity
phase locked loops
Phase noise
Quantization (signal)
quantization noise
spurious tones
Synthesizers
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Zusammenfassung: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.
ISSN:1549-8328
1558-0806
DOI:10.1109/TCSI.2019.2958781