Clock recovery device with switchable transient non-linear phase adjuster
US10250379B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 12, 2017 |
| Grant date | Apr 2, 2019 |
| Priority date | — |
| Expiry date | Sep 12, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04J3/0667
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A clock recovery device recovers a master clock over a packet network from incoming synchronization packets. A frequency locked loop generates a control input to a controlled oscillator, which generates an output clock. The frequency locked loop is responsive to pure offset information obtained from the incoming synchronization packets. A transient phase adjuster extracts information from the incoming synchronization packets taking into account transit delays to effect fast frequency adjustment of the control input and to provide a phase adjustment input to the frequency locked loop. A secondary phase path is selectable in response to de-activation of the transient phase adjuster to provide a phase correction to the control input derived from said pure offset information when the transient phase adjuster is inactive.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.