Direct Digital Synthesis (DDS) technology is relative to Direct Analog Frequency Synthesis (DAS) technology. The DDS directly generates signals in discrete time, and generates modulated signals by varying amplitude, frequency, and phase, so that arbitrary waveforms can be generated for digital communication systems. Important aspects such as digital up-conversion, local carrier generation, and voltage-controlled oscillators in software radio systems can be implemented using DDS technology.
Direct Digital Frequency Synthesizer (DDFS) with DDS technology can be divided into different categories such as sinusoidal output DDS, pulse output DDS and phase insertion DDS. Among them, sinusoidal output DDS is the most common.
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