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    Analysis of 3-Level Bandpass Sigma-Delta Modulators With 2-Level Output


    Podsiadlik, Tomasz and Dooley, John and Farrell, Ronan (2016) Analysis of 3-Level Bandpass Sigma-Delta Modulators With 2-Level Output. IEEE Transactions on Circuits and Systems II: Express Briefs, 65 (4). pp. 506-510. ISSN 1558-3791

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    Abstract

    This brief analyzes a recently introduced, 2-level bandpass modulator incorporating 3-level lowpass ΣΔ modulators. While the combination of 3-level ΣΔ with 2-level output improves output signal-to-noise ratio (SNR) in a wideband sense, it also introduces nonlinear distortion in the 2-level output. In this brief, the nonlinear effects are modeled and a linearization technique offering up to 22 dB of error cancellation is derived. In result, the modified 2-level modulator can show up to 6 dB of an SNR improvement versus equivalent for a 2-level ΣΔ modulator. The new technique is demonstrated through analysis and experimental results.

    Item Type: Article
    Keywords: Field-programmable gate array (FPGA); linear model; predistortion; sigma delta;
    Academic Unit: Faculty of Science and Engineering > Electronic Engineering
    Faculty of Science and Engineering > Research Institutes > Hamilton Institute
    Item ID: 10280
    Identification Number: https://doi.org/10.1109/TCSII.2016.2639282
    Depositing User: Dr. Ronan Farrell
    Date Deposited: 05 Dec 2018 14:46
    Journal or Publication Title: IEEE Transactions on Circuits and Systems II: Express Briefs
    Publisher: IEEE
    Refereed: Yes
    URI:

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