Higher-order DWA in bandpass delta-sigma modulators and its implementation

Jingjing Hu, J.A. Hegt, A.H.M. van Roermund, Sotir F. Ouzounov

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1 Citation (Scopus)

Abstract

This paper proposes a simple implementation of a higher-order data weighted averaging algorithm to spectrally shape mismatch errors of a multi-bit D/A converter in a bandpass (BP) delta-sigma modulator. The proposed implementation avoids the need for a complex and slow sorting function that is usually associated with a higher-order DWA algorithm. An algorithm based on updating two pointers is used, similar as the widely used first-order DWA algorithm. The implementation is based on a pulse density modulated DAC that is clocked at a 3x higher rate compared to the delta-sigma modulator clock to accurately implement the 1x and 3x weight factors that are required by the algorithm. The implementation can also be used in a generalized bandpass DWA algorithm that can be easily adjusted to tune the noise-shaping characteristic to different center frequencies.

Original languageEnglish
Title of host publicationISCAS 2016 - IEEE International Symposium on Circuits and Systems
Place of PublicationPiscataway
PublisherInstitute of Electrical and Electronics Engineers
Pages73-76
Number of pages4
ISBN (Electronic)978-1-4799-5341-7
ISBN (Print)978-1-4799-5342-4
DOIs
Publication statusPublished - 29 Jul 2016
Event2016 IEEE International Symposium on Circuits and Systems (ISCAS 2016) - Montreal, Canada
Duration: 22 May 201625 May 2016

Conference

Conference2016 IEEE International Symposium on Circuits and Systems (ISCAS 2016)
Abbreviated titleISCAS 2016
CountryCanada
CityMontreal
Period22/05/1625/05/16

Keywords

  • analog-to-digital converters
  • bandpass delta-sigma modulator
  • data-weighted averaging (DWA)
  • sigma-delta modulator

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  • Cite this

    Hu, J., Hegt, J. A., van Roermund, A. H. M., & Ouzounov, S. F. (2016). Higher-order DWA in bandpass delta-sigma modulators and its implementation. In ISCAS 2016 - IEEE International Symposium on Circuits and Systems (pp. 73-76). [7527173] Institute of Electrical and Electronics Engineers. https://doi.org/10.1109/ISCAS.2016.7527173