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,  

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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.