ADSL CODEC Architecture that Minimizes DSP Computational Burden

  • Richard K. Hester


The optimum analog front-end architecture for ADSL modems results from careful consideration of international ADSL standards, the attenuation characteristics of subscriber loops, the echo return loss of typical hybrid networks and the duplexing method employed. The architecture proposed here is based upon oversampled data converters. It relies on digital filters for standards compliance and minimizes analog filters.


Quantization Noise Central Office Analog Filter Standard Compliance Canonical Signed Digit 
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  1. 1.
    Proposed Summaries for new Recommendations G.992.1, G.992.2, G.994.1, G.995.1, G.996.1 and G.997.1, ITU-Telecommunications Standardization Sector, Study Group 15, Geneva, 12 October, 1998.Google Scholar
  2. 2.
    D. Langford, B. Tesch, B. Williams and G. Nelson, “A BiCMOS Analog Front-End Circuit for an FDM-Based ADSL System,” IEEE J Solid-State Circuits, vol. 33, pp. 1383–1393, Sept. 1998.CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media Dordrecht 1999

Authors and Affiliations

  • Richard K. Hester
    • 1
  1. 1.Texas Instruments IncorporatedDallasUSA

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