Offset calibration and adaptive channel data sample positioning
US8923463B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 29, 2013 |
| Grant date | Dec 30, 2014 |
| Priority date | — |
| Expiry date | Aug 29, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/069
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
In an apparatus, a receiver includes a clock data recovery module to provide a dense distribution of waveform edges across an adjustment range, and an eye scan circuit to obtain samples at a first sample position and a second sample position to provide an error count for a sample count for the samples. An eye scan module, coupled to the receiver, is configured to: scan for the samples at the first sample position of a first type for each of a plurality of sample positions of a second type to obtain an error count for a sample count for each of the plurality of sample positions; locate a threshold BER from the scan; determine an amount and a direction of a sample offset at the threshold BER from a reference location; and adjust either the first sample position or the second sample position responsive to the amount and the direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.