Clock recovery phase detector
US5455847A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 10, 1992 |
| Grant date | Oct 3, 1995 |
| Priority date | — |
| Expiry date | Jul 10, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L7/0334
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A phase detector for symbol clock recovery in a digital communications system determines the phase error of a local symbol clock from the symbol rate of a transmitted signal by sampling the transmitted signal to obtain a first sample at a fraction of a symbol period after the symbol clock and to obtain a second sample at an equal fraction of a symbol period before the symbol clock, and determining a phase error equal to the difference between a function of the magnitude of the first sample and a function of the magnitude of the second sample. The function is preferably the square of the magnitude or the logarithm of the magnitude of the samples.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.