Method and apparatus for sampling point optimization
US9020085B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 14, 2013 |
| Grant date | Apr 28, 2015 |
| Priority date | — |
| Expiry date | Mar 14, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/03
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for timing optimization are disclosed, which rely on information gathered from a timing detection circuit to find the optimal sampling point of a data recovery system. In an implementation, a timing shift is optimized based on Gardner detector data. In an example, a Gardner detector, or an early and late extraction portion thereof, is added to the data path, and the data path clock is shifted so that it is centered on the data transition mean. In an implementation, the sampling point of the data path is optimized for better horizontal eye opening using a Gardner detector's output for centering the average crossing point of different paths. In an example embodiment, an apparatus is provided with a second clock recovery that is not completely independent of a first clock recovery.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.