Loss of signal detection on CDR
US9515852B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 1, 2015 |
| Grant date | Dec 6, 2016 |
| Priority date | — |
| Expiry date | Sep 1, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L7/033
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
The present invention is directed to data communication. More specifically, an embodiment of the present invention provides a technique for detecting loss of signal. An incoming data stream is sampled and a recovered clock signal is generated accordingly. An output clock signal of a higher frequency than the recovered clock signal is generated by a transmission PLL. The frequency of the recovered clock signal is compared to a divided frequency of the output clock signal. If a difference between the recovered clock signal and the output clock signal is greater than a threshold, a loss of signal indication is provided. There are other embodiments as well.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.