文章基本信息

标题：A Numerically Controlled Oscillator with a Fine Phase Tuner and a Rounding Processor
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作者：Lim, In-Gi ; Kim, Whan-Woo
期刊名称：ETRI Journal
印刷版ISSN：1225-6463
电子版ISSN：2233-7326
出版年度：2004
卷号：26
期号：6
页码：657-657
语种：English
出版社：Electronics and Telecommunications Research Institute
摘要：We propose a fine phase tuner and a rounding processor for a numerically controlled oscillator (NCO), yielding a reduced phase error in generating a digital sine waveform. By using the fine phase tuner presented in this paper, when the ratio of the desired sine wave frequency to the clock frequency is expressed as a fraction, an accurate adjustment in representing the fractional value can be achieved with simple hardware. In addition, the proposed rounding processor reduces the effects of phase truncation on the output spectrum. Logic simulation results of the NCO using these techniques show that the noise spectrum and mean square error (MSE) for eight output bits of a 3.125 MHz sine waveform are reduced by 8.68 dB and 5.5 dB, respectively, compared to those of the truncation method, and 2.38 dB and 0.83 dB, respectively, compared to those of Paul's scheme.
关键词：Numerically controlled oscillator (NCO);sine wave generator;look-up table;fine phase tuner;rounding processor