Spread spectrum clock and reference signal generator
US7719371B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 30, 2007 |
| Grant date | May 18, 2010 |
| Priority date | — |
| Expiry date | Jan 10, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03B2200/005
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Exemplary embodiments of the invention provide a system, method and apparatus for spread spectrum functionality for a free-running, reference harmonic oscillator. In an exemplary embodiment, an apparatus comprises a reference oscillator adapted to provide a reference signal having a reference frequency; and a spread spectrum controller adapted to control the reference oscillator to generate a spread-spectrum reference signal at a plurality of different reference frequencies during a predetermined or selected time period. An exemplary apparatus may also include a coefficient register adapted to store a plurality of coefficients and a plurality of controlled reactance modules responsive to a corresponding coefficient of the plurality of coefficients to modify an amount of reactance effectively coupled to the reference oscillator. An exemplary spread spectrum controller is further adapted to sequentially modify the plurality of coefficients during the predetermined time period to provide the spread spectrum reference signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.