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March [Communications] Power-Saving Design Brings DDS Flexibility To Portables Direct digital synthesis (DDS) has served a wide range of applications due to its fast frequency switching speed and modulation capabilities. But it has often been relegated to a secondary choice in favor of analog phase-locked- loop (PLL) synthesis for cases where low power consumption and low cost are key factors. However, the model AD9913 from Analog Devices (www.analog.com) provides the fast-switching and modulation ... August 2006 [Systems & Subsystems] Signal Cancellation Improves DDS SFDR Direct digital synthesizers (DDS) are commonly used for sinusoidal signal generation in RF communication systems and test equipment. An integral component of DDS is the digital-to-analog converter (DAC). Although a DAC is intended to perfectly reproduce an analog signal from its digital equivalent, the conversion process is rarely perfect. The DAC's digital resolution (number of bits) is a limiting factor that introduces quantization errors resulting in a noise floor. ... |
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