Adaptive lock position circuit
US7049869B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 1, 2004 |
| Grant date | May 23, 2006 |
| Priority date | — |
| Expiry date | Sep 16, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L7/0029
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An adaptive lock position circuit includes a jitter distribution extremity detector and a phase shifting circuit. The jitter distribution extremity detector receives an input data signal and is operable to compare the input data signal with one or more clock signals derived from a recovered clock signal from a clock and data recovery (CDR) circuit to generate one or more control signals that define the boundaries of a jitter extremity detection window. The phase shifting circuit is coupled in a feedback loop with the jitter distribution extremity detector and receives the one or more control signals from the jitter distribution extremity detector and also receives the recovered clock signal. The phase shifting circuit is operable to shift the phase of the recovered clock signal as a function of the one or more control signals to generate a retiming clock signal such that an edge of the retiming clock signal is interpolated within the jitter extremity detection window.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.