A Numerically Controlled Oscillator with a Fine Phase Tuner and a Rounding Processor

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...

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Bibliographic Details
Published in:ETRI journal 2004-12, Vol.26 (6), p.657-660
Main Authors: Lim, In‐Gi, Kim, Whan‐Woo
Format: Article
Language:English
Subjects:
fine phase tuner
look‐up table
Numerically controlled oscillator (NCO)
rounding processor
sine wave generator
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Summary: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.
ISSN:1225-6463
2233-7326
DOI:10.4218/etrij.04.0204.0026