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Effective ROM Compression Methods for Direct Digital Frequency Synthesis  

이진철 (삼성전자 통신연구원)
신현철 (한양대학교 전자전기제어계측공학과)
Publication Information
Journal of KIISE:Computer Systems and Theory / v.31, no.9, 2004 , pp. 536-542 More about this Journal
Abstract
An architecture of direct digital frequency synthesizers (DDFS) is studied in this paper The Direct digital frequency synthesizers (DDFS) provide fast frequency switching with high spectral purity and are widely used in modern spread spectrum wireless communication systems. ROM-based DDFS uses a ROM lookup table to store the amplitude of a sine wave. In this paper, we suggest three new techniques to reduce the ROM size. One new technique uses more number of hierarchical levels in ROM structures. Another techniques use simple interpolation techniques combined with hierarchical ROM structures. A 12 bit sine wave is generated by using these techniques. Experimental results show that the new proposed techniques can reduce the required ROM size by up to 24%, when compared to that of a resent method[1].
Keywords
Direct Digital Frequency Synthesizer; ROM Compression;
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