An efficient direct digital frequency synthesizer based on two-level table lookup

J. C. Chih*, J. Y. Chou, Sau-Gee Chen

*此作品的通信作者

    研究成果: Conference article同行評審

    6 引文 斯高帕斯(Scopus)

    摘要

    This paper proposes a new direct digital frequency synthesizer (DDFS). It has the merits of high speed, low complexity and high spectrum purity. It is based on the Taylor's expansion method for sinusoidal and cosine functions, combined with a two-level table-lookup algorithm. The new DDFS is efficient, with a small table size and low computational complexity. In all, this new DDFS needs three lookup tables, each of size 2N/4, which is smaller than the other table-lookup methods, such as Madisetti, et al., (of size 2N/3). The DDFS is non-recursive, which is free of error-propagation problem inherently in the recursive DDFS's. For N=16-bits example, simulation shows that the new DDFS has a high SFDR (spurious free dynamic range) of 100 dBc.

    原文English
    頁(從 - 到)824-827
    頁數4
    期刊Proceedings of the Annual IEEE International Frequency Control Symposium
    DOIs
    出版狀態Published - 2001
    事件2001 IEEE International Symposium Frequency Control Symposium and PDA Exhibition - Seattle, WA, United States
    持續時間: 6 6月 20018 6月 2001

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