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Multiple trigonometric approximation of sine-amplitude with small ROM size for direct digital frequency synthesizers

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5 Author(s)
Yong Sin Kim ; Korea Univ., Seoul, South Korea ; Soo Hwan Kim ; Kwang-Hyun Baek ; Suki Kim
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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.

Published in:

VLSI Design, 2003. Proceedings. 16th International Conference on

Date of Conference:

4-8 Jan. 2003