DDS driven DDS synthesizer for generating sinewave waveforms with reduced spurious signal levels
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United States of America Patent
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Jan 28, 1997
Grant Date -
N/A
app pub date -
Nov 8, 1994
filing date -
Nov 8, 1994
priority date (Note) -
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Abstract
ADDS driven DDS Synthesizer (DDS.sup.2 Synthesizer) is disclosed, wherein the first DDS--a Reference DDS--generates a high resolution tunable output signal, which is in turn expanded and/or upconverted to the frequency bandwidth and range required by the clock of the second DDS--a DDS Divider. The DDS Divider acts as a programmable 'sinewave divider' of its tunable input clock by division ratios 'n' limited to the set of small integer numbers 3; 4; 5; 6 . . . , chosen to eliminate phase truncation spurs and limit quantization spurs to harmonics of the fundamental output and thus to provide a high spectral purity, high resolution, fast switching DDS based synthesizer.
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