Direct Digital Synthesis


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Direct Digital Synthesis
Direct Digital SynthesisDirect digital frequency synthesis (DDFS) is an oscillator scheme wherein a digital representation of the desired signal is generated and then applied to a D/A converter to convert the digital representation to an analog waveform. Advances in high-speed microelectronics, particularly the microprocessor, make DDFS practical at frequencies in the very-high-frequency band and below. Systems can be compact, use low power, and provide fine frequency resolution with virtually instantaneous switching of frequencies. DDFS is finding increasing application, particularly in conjunction with PLL synthesizers.DDFS uses a single-frequency source (clock) as a time reference. One method of digitally generating the val…
Citation
Prof. Dr.-Ing. habil. Dr. h.c. mult. Ulrich L. Rohde; Jerry C. Whitaker; Hans Zahnd: Communications Receivers: Principles and Design, Fourth Edition. Direct Digital Synthesis, Chapter (McGraw-Hill Professional, 2017), AccessEngineering Export