An alternative approach to the ROM-less direct digital synthesis

The author demonstrates how the idea of a ROM-less direct digital synthesizer, presented in a recent paper by Nakagawa and Nosaka (see ibid., vol. 32, no. 5, p. 766-70, 1997) can be derived based on different premises, leading to a different architecture. The approach presented here may enhance the understanding of what can be done to eliminate the pulse-position jitter inherent in the accumulator, and thus provide the designer with additional degree of freedom in choosing the ultimate structure of the synthesizer.