DDS driven DDS synthesizer for generating sinewave waveforms with reduced spurious signal levels
US5598440A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 8, 1994 |
| Grant date | Jan 28, 1997 |
| Priority date | — |
| Expiry date | Nov 8, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F1/0321
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.