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A Phase Interpolation Direct Digital Synthesizer with a Symmetrically Structured Delay Generator
Hideyuki NOSAKA Tadao NAKAGAWA Akihiro YAMAGISHI
Publication
IEICE TRANSACTIONS on Electronics
Vol.E82-C
No.7
pp.1067-1072 Publication Date: 1999/07/25 Online ISSN:
DOI: Print ISSN: 0916-8516 Type of Manuscript: Special Section PAPER (Special Issue on Microwave and Millimeter Wave Technology) Category: Active Devices and Circuits Keyword: direct digital synthesizer, frequency synthesizer, delay generator, spread spectrum, jitter elimination,
Full Text: PDF>>
Summary:
We have developed a new type of phase interpolation direct digital synthesizer (DDS) with a symmetrically structured delay generator. The new DDS is similar to a sine output DDS in that it produces lower spurious signals, but it does not require a sine look-up table. The symmetrically structured delay generator reduces the periodic jitter in the most significant bit (MSB) of the DDS accumulator. The symmetrical structure enables the delay generator to produce highly accurate delay timing and eliminates the need to adjust the circuit constants. Experimental results confirm frequency synthesizer operation in which the spurious signal level is reduced to less than that of the accumulator.
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