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Spur Reduction Techniques in Sine Output Direct Digital Synthesizer

  • Jouko Vankka
  • Kari Halonen
Chapter
Part of the The Springer International Series in Engineering and Computer Science book series (SECS, volume 614)

Abstract

The drawback of the direct digital synthesizer (DDS) is the high level of spurious frequencies [Rei93]. In this chapter we only concentrate on the spurs that are caused by the finite word length representation of phase and amplitude samples. The number of words in the ROM (phase to amplitude converter) will determine the phase quantization error, while the number of bits in the digital-to-analog converter (D/A-converter) will affect amplitude quantization. Therefore, it is desirable to increase the resolution of the ROM and D/A-converter. Unfortunately, larger ROM and D/A-converter resolutions mean higher power consumption, lower speed, and greatly increased costs. Memory compression techniques could be used to alleviate the problem, but the cost of different techniques is an increase in circuit complexity and distortions (see Section 6.2).

Keywords

Word Length Output Frequency Phase Accumulator Error Feedback Amplitude Error 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 2001

Authors and Affiliations

  • Jouko Vankka
    • 1
  • Kari Halonen
    • 1
  1. 1.Helsinki University of TechnologyFinland

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