Fast lock scheme for phase locked loops and delay locked loops
US7466174B2 · kind B2 · utility
11Cited by
75References
28Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 31, 2006 |
| Grant date | Dec 16, 2008 |
| Priority date | — |
| Expiry date | Mar 31, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/0893
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A fast lock scheme for phase locked loops and delay locked loops, where apparatus, systems, and methods include a startup circuit that is enabled at the beginning of a startup mode and is disabled upon a phase transition detection in the reference and feedback signals to the phase locked loop or delay locked loop. Further apparatus, systems, and methods enable a first charge pump when a phase transition is detected, and enable a second charge pump when the phase difference between the reference and feedback signals fall within a predetermined range.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.