Comparison of dithering and adaptive schemes used in sigma - delta modulators

Saman S. Abeysekera, Antonio Cantoni

    Research output: Contribution to journalConference articlepeer-review


    This paper addresses the selection of a suitable dither sequence for given Sigma-Delta modulator-demodulator characteristics. We have shown using mathematical analysis and simulations, that it is possible to select an appropriate dither sequence which produces minimum worst case quantization noise power for a specified input d.c. value dynamic range and low-pass filter bandwidth. In this approach, pseudo random sequences are used for dithering. The optimum dither sequence periodicity is selected on the basis of the range of input d.c. values and the filter bandwidth. The conditions under which optimum dithering schemes are superior to adaptive schemes are also identified in the paper. It is possible to extend the analysis presented in the paper to higher order modulators.

    Original languageEnglish
    Pages (from-to)57-60
    Number of pages4
    JournalProceedings - IEEE International Symposium on Circuits and Systems
    Publication statusPublished - 1 Jan 1996
    EventProceedings of the 1996 IEEE International Symposium on Circuits and Systems, ISCAS. Part 1 (of 4) - Atlanta, GA, USA
    Duration: 12 May 199615 May 1996


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