Precise Frequency Generation with Digital Modulation Using Direct Digital Synthesis

Johann L. Ong


Frequency synthesis or generation of baseband continuous wave signals is usually implemented through traditional analog techniques using tuned LC tank circuits, quartz crystals or phase-locked loops. This paper discusses a digital alternative, direct digital synthesis (DDS), and compares it with analog methods. A commercially available DDS chip and the results of a DDS system implemented using it are also presented.

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