Title :
Multiple trigonometric approximation of sine-amplitude with small ROM size for direct digital frequency synthesizers
Author :
Kim, Yong Sin ; Kim, Soo Hwan ; Baek, Kwang-Hyun ; Kim, Suki ; Kang, Sung-Mo
Author_Institution :
Korea Univ., Seoul, South Korea
Abstract :
A ROM size reduction technique based on a new sine-amplitude approximation with small ROM size for direct digital frequency synthesizers is presented. With use of the proposed multiple trigonometric approximation for 12-bit phase to 10-bit amplitude mapping, the number of ROM output bits and ROM size are reduced by 5 and 44.45%, respectively, compared to the quarter sine wave technique, with comparable spectral purity. The proposed approach is also applied to a ROM segmentation method for further ROM size reduction, which has a compression ratio of 55:1.
Keywords :
CMOS digital integrated circuits; approximation theory; circuit CAD; direct digital synthesis; integrated circuit design; read-only storage; table lookup; 10 bit; 12 bit; CMOS technology; DDS; ROM segmentation method; ROM size reduction technique; ROM-based look-up table; direct digital frequency synthesizers; multiple trigonometric approximation; sine-amplitude approximation; Communication switching; Frequency synthesizers; Partitioning algorithms; Power dissipation; Propagation delay; Read only memory; Silicon compounds; Table lookup; Very large scale integration;
Conference_Titel :
VLSI Design, 2003. Proceedings. 16th International Conference on
Print_ISBN :
0-7695-1868-0
DOI :
10.1109/ICVD.2003.1183147
