Wandering spurs in MASH 1-1 delta-sigma modulators

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Wandering spurs in MASH 1-1 delta-sigma modulators

Donnelly, Yann; Kennedy, Michael Peter
Date: 2019-01-29
Copyright: © 2019, IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Citation: Donnelly, Y. and Kennedy, M.P. (2019) 'Wandering spurs in MASH 1-1 delta-sigma modulators', IEEE Transactions on Circuits and Systems I: Regular Papers, pp. 1-14. doi:10.1109/TCSI.2019.2893435
Published Version: 10.1109/TCSI.2019.2893435

Abstract:

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.

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