(DDS) A process by which you can digitally generate a frequency-agile,
highly-pure sinewave, or arbitrary waveform, from an
accurate reference clock. The digital output waveform is typically
tuned by a 32-bit digital word which allows sub-Hz frequency
agility. The DDS's frequency output is normally reconstructed
with a high-speed, high- performance D/A to generate an analog
output signal. The ability to add internal functions such as phase
modulation, amplitude modulation, digital filtering, and I&Q
outputs, are making DDS devices attractive for digital
communication applications. They serve in capacities such as
modulators, local oscillators, and clock detect/recovery circuits.