Methods and apparatus for multiple-stage CTLE adaptation
US9172566B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 18, 2013 |
| Grant date | Oct 27, 2015 |
| Priority date | — |
| Expiry date | Feb 22, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/03885
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method of equalizing an input data signal using a multiple-stage continuous-time linear equalization (CTLE) circuit. A zero-forcing least-mean-square (ZF LMS) procedure is applied to adapt the settings of the CTLE stages. The amplitude settings and the frequency boost settings of the CTLE stages are adapted within the ZF LMS procedure. In an exemplary implementation, an error screening threshold may be applied to an error signal within the ZF LMS procedure to generate a reduced error signal such that weight updates do not occur if the error signal is below the error screening threshold. In addition, if an accumulated sign error signal within the ZF LMS procedure reaches a predetermined maximum indicative of a high loss channel, then a setting for a variable gain amplifier may be increased, and an amplitude setting for the CTLE circuit may be decreased. Other embodiments, aspects and features are also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.