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DT Modeling of Clock Phase Noise Effects in LP CT Delta-Sigma ADCs with RZ Feedback

Andersson, Martin LU and Sundström, Lars LU (2009) In IEEE Transactions on Circuits and Systems II: Express Briefs 56(7). p.530-534
Abstract
The performance of continuous-time (CT) Delta Sigma modulators is limited by their sensitivity to clock phase noise (PN). The clock PN-induced in-band noise (IBN) is dependent on the magnitude and frequency of both the desired in-band signals and the out-of-band signals, as well as the shape of the clock PN spectrum. This brief presents a discrete-time (DT) model of the dominant clock PN-induced errors. It enables fast and accurate simulations of the clock PN effects with arbitrary input signals, PN spectra, and noise-transfer functions. The model has been verified by CT simulations and measurements on a second-order low-pass CT Delta Sigma modulator with return-to-zero feedback. The flexibility and usefulness of the DT model are... (More)
The performance of continuous-time (CT) Delta Sigma modulators is limited by their sensitivity to clock phase noise (PN). The clock PN-induced in-band noise (IBN) is dependent on the magnitude and frequency of both the desired in-band signals and the out-of-band signals, as well as the shape of the clock PN spectrum. This brief presents a discrete-time (DT) model of the dominant clock PN-induced errors. It enables fast and accurate simulations of the clock PN effects with arbitrary input signals, PN spectra, and noise-transfer functions. The model has been verified by CT simulations and measurements on a second-order low-pass CT Delta Sigma modulator with return-to-zero feedback. The flexibility and usefulness of the DT model are demonstrated, and the two dominant clock PN effects are compared by means of simulations with orthogonal frequency-division multiplexing input signals and various PN specifications. (Less)
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type
Contribution to journal
publication status
published
subject
in
IEEE Transactions on Circuits and Systems II: Express Briefs
volume
56
issue
7
pages
530 - 534
publisher
IEEE - Institute of Electrical and Electronics Engineers Inc.
external identifiers
  • wos:000268171700002
  • scopus:68249146449
ISSN
1549-7747
DOI
10.1109/TCSII.2009.2020950
language
English
LU publication?
yes
id
71e8860a-a7f6-47eb-a663-44cf761f62c6 (old id 1037991)
date added to LUP
2016-04-01 11:37:02
date last changed
2025-10-14 13:26:23
@article{71e8860a-a7f6-47eb-a663-44cf761f62c6,
  abstract     = {{The performance of continuous-time (CT) Delta Sigma modulators is limited by their sensitivity to clock phase noise (PN). The clock PN-induced in-band noise (IBN) is dependent on the magnitude and frequency of both the desired in-band signals and the out-of-band signals, as well as the shape of the clock PN spectrum. This brief presents a discrete-time (DT) model of the dominant clock PN-induced errors. It enables fast and accurate simulations of the clock PN effects with arbitrary input signals, PN spectra, and noise-transfer functions. The model has been verified by CT simulations and measurements on a second-order low-pass CT Delta Sigma modulator with return-to-zero feedback. The flexibility and usefulness of the DT model are demonstrated, and the two dominant clock PN effects are compared by means of simulations with orthogonal frequency-division multiplexing input signals and various PN specifications.}},
  author       = {{Andersson, Martin and Sundström, Lars}},
  issn         = {{1549-7747}},
  language     = {{eng}},
  number       = {{7}},
  pages        = {{530--534}},
  publisher    = {{IEEE - Institute of Electrical and Electronics Engineers Inc.}},
  series       = {{IEEE Transactions on Circuits and Systems II: Express Briefs}},
  title        = {{DT Modeling of Clock Phase Noise Effects in LP CT Delta-Sigma ADCs with RZ Feedback}},
  url          = {{http://dx.doi.org/10.1109/TCSII.2009.2020950}},
  doi          = {{10.1109/TCSII.2009.2020950}},
  volume       = {{56}},
  year         = {{2009}},
}