標題: An efficient direct digital frequency synthesizer based on two-level table lookup
作者: Chih, JC
Chou, JY
Chen, SG
交大名義發表
National Chiao Tung University
公開日期: 2001
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 [1], [2]. 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 2(N/4), which is smaller than the other table-lookup methods, such as Madisetti, et al., (of size 2(N/3)) [3], [4]. 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.
URI: http://hdl.handle.net/11536/19019
ISBN: 0-7803-7028-7
ISSN: 1075-6787
期刊: PROCEEDINGS OF THE 2001 IEEE INTERNATIONAL FREQUENCY CONTROL SYMPOSIUM & PDA EXHIBITION
起始頁: 824
結束頁: 827
顯示於類別:會議論文