Wandering Spurs in MASH 1-1 Delta-Sigma Modulators

Wandering spurs are a little-studied phenomenon seen in MASH and SQ-digital delta-sigma modulators. They take the form of frequency-modulated spurs which periodically appear in-band. Since modulators are often employed as divide ratio controllers in fractional- {N} phase lock loops, these spurs can...

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Bibliographic Details
Published in:IEEE transactions on circuits and systems. I, Regular papers Regular papers, 2019-07, Vol.66 (7), p.2426-2439
Main Authors: Donnelly, Yann, Kennedy, Michael Peter
Format: Article
Language:English
Subjects:
delta-sigma
Delta-sigma modulation
experimental
Frequency modulation
MASH
modulator
Modulators
Multi-stage noise shaping
phase lock loop
Phase locked loops
Phase modulation
Phase noise
PLL
spectrum
spur
Wandering spur
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Summary:Wandering spurs are a little-studied phenomenon seen in MASH and SQ-digital delta-sigma modulators. They take the form of frequency-modulated spurs which periodically appear in-band. Since modulators are often employed as divide ratio controllers in fractional- {N} phase lock loops, these spurs can feed into the output phase noise spectrum. In this paper, we explain the mechanism which creates the wandering spurs and offer a prediction for the behavior of these spurs in the MASH 1-1 modulator. Simulation results are presented which confirm our theoretical predictions.
ISSN:1549-8328
1558-0806
DOI:10.1109/TCSI.2019.2893435