Digital frequency synthesizer
US7782988B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 2, 2005 |
| Grant date | Aug 24, 2010 |
| Priority date | — |
| Expiry date | Dec 27, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/16
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A system and method for synthesizing a frequency using a multi-phase oscillator. A state machine operating on one of the phases of the oscillator computes, based on a pair of input integers, a phase select vector that indicates when a particular phase of the multi-phase oscillator should be selected when a transition of the waveform of the output frequency is needed. The phase select vector is then re-timed to form a retimed phase vector so that each phase select signal is in phase with signal it is designed to select. The signals in the retimed phase vector then can be combined to create the output frequency directly or can be used to select the corresponding phase of the multi-phase oscillator, if more accuracy is desired. In one embodiment, the multi-phase oscillator is a rotary traveling wave oscillator which provides highly accurate multiple phases.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.