Direct digital to analog microwave frequency signal simulator
US5764087A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 7, 1995 |
| Grant date | Jun 9, 1998 |
| Priority date | — |
| Expiry date | Jun 7, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F1/0335
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A direct digital-to-analog microwave frequency signal synthesizer device which employs both wideband and narrowband direct digital frequency synthesizer (DDFS) circuitry to improve frequency and phase agility, reduce spurious performance, and minimize direct analog circuitry. A clock output having an extremely precise and highly stabilized frequency is fed to the wideband DDFS circuit and to the narrowband DDFS circuit. One or the other is selectively enabled by control logic circuitry. When the former is enabled, precision, high frequency resolution, low spurious, fast frequency switching is achieved at the microwave output. When the latter is enabled, precision, high frequency and phase resolution, low spurious, is achieved, providing frequency chirp, and frequency phase control at the microwave output. The output of the wideband DDFS circuit is processed to reduce the spurious response and up-converted, while the output of the narrow band DDFS circuit is directly up-converted. The selected DDFS circuit, is frequency up-converted to provide a synthesized microwave output signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.