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A Non-Feedback Δ-Σ Modulator for Digital-to-Analog Conversion Using Digital Frequency Modulation

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Abstract

This paper describes a novel noise-shaping Δ-Σ modulator for D/A-conversion which has no global feedback. The proposed topology is well suited for a pipelined clocking scheme allowing increased oversampling ratios for both first and higher order modulators. The maximum clock-frequency of the new modulator is limited only by the delay through one single accumulator regardless of modulator order, which represents a huge saving compared to the conventional modulator. The converter is very modular and scales easily to higher modulator orders. Still the proposed topology is mathematically equivalent to the classical Δ-Σ modulator. Theoretical analysis and circuit simulations for a first- and second-order modulator are presented. The first-order circuit has been implemented in a FPGA-circuit from Altera and measured results are presented.

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Authors and Affiliations

  1. Microelectronic Systems Group, Department of Informatics, University of Oslo, Gaustadalléen 23, Blindern, NO-0373, Oslo, Norway

    Dag T. Wisland, Mats E. Høvin & Tor S. Lande

Authors
  1. Dag T. Wisland
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  2. Mats E. Høvin
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  3. Tor S. Lande
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Wisland, D.T., Høvin, M.E. & Lande, T.S. A Non-Feedback Δ-Σ Modulator for Digital-to-Analog Conversion Using Digital Frequency Modulation. Analog Integrated Circuits and Signal Processing 41, 209–222 (2004). https://doi.org/10.1023/B:ALOG.0000041637.75702.c3

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  • DOI: https://doi.org/10.1023/B:ALOG.0000041637.75702.c3

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