Serial transmitter with feed forward equalizer and timing calibration
US9942028B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 2, 2017 |
| Grant date | Apr 10, 2018 |
| Priority date | — |
| Expiry date | Feb 2, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2025/03363
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A timing error detection circuit for calibrating a serial transmitter is disclosed. The circuit includes a data source configured to provide data for serial transmission and a clock source configured to produce N versions of a sampling clock that are at N different phases of the sampling clock. The detection circuit has a first sampler configured to sample the data source by using a first phase of the sampling clock to generate a first sampled signal and a second sampler configured to sample the data source by using a second phase of the sampling clock to generate a second sampled signal. The detection circuit also includes a first comparator configured to compare the first and second sampled signals to generate a difference signal and a first low-pass filter configured to filter the difference signal to generate an average difference voltage. A second comparator in the detection circuit is configured to compare the average difference voltage with a reference voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.