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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. ... July 2005 [Devices & ICs] DDS IC Initiates Synchronized Signals Direct-digital-synthesizer (DDS) technology allows a single source to precisely control signal frequency and phase with high-speed switching. But integrate multiple DDS devices on a single integrated circuit, and the capability expands to synchronized signal generation for a wide range of commercial and military applications. The new AD9958 dual-DDS and AD9959 quad-DDS devices offer such capability, with 32-b frequency tuning resolution, 10-b amplitude tuning resolution, and speeds to 500... |
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