Minimization of DDS Spurious Content in Multi-Channel Systems

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  • Author: Ryan Groulx and Shawn Mason, Rockwell Collins
Implementing a Direct Digital Synthesizer (DDS) IC in a new design can be a daunting task. Many times, the DDS is looked upon as a “noise generator” and the unfortunate designer is left to deal with whatever output spectrum the DDS presents after the basic design is complete. The DDS is in a unique class of ICs that joins the once sepa-rate worlds of digital and RF circuit design. Despite these challenges, the designer can predict the output spectrum of the DDS with a high degree of accuracy with the knowledge of several basic concepts