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http://dx.doi.org/10.7840/kics.2016.41.10.1179

The Differential Quantized Direct Digital Frequency Synthesizer Based on Sine-Linear Phase Difference  

Kim, Chong-il (Catholic Kwandong University, Department of Electronic Engineering)
Lee, Hyun-seung (Department of Electronic Engineering Catholic Kwandong University)
Hong, Chan-ki (Catholic Kwandong University, Department of computer science)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.41, no.10, 2016 , pp. 1179-1182 More about this Journal
Abstract
In this paper, a new method to reduce the size of ROM in the direct digital frequency synthesizer (DDFS) is proposed. This method use the sine-linear phase difference method and differential PCM. The new ROM compression method can reduce the ROM size by using the two ROM. The quantized value of sine-linear phase difference is saved by the ROM1 of the $2^N$ sample period. The ROM2 save the difference between the original sine-linear phase difference value and the saved sample value of the ROM1. The ROM compression ratio of 37% is achieved by this method. Also, the power consumption is decreased according to the ROM size reduction.
Keywords
Direct Digital Frequency Synthesizer; DDFS; sine-linear phase difference; phase-to-sine converter; ROM reduction;
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