Noise-tolerant signaling schemes supporting simplified timing and data recovery
US7292637B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 17, 2003 |
| Grant date | Nov 6, 2007 |
| Priority date | — |
| Expiry date | Nov 2, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/0276
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Described are communication systems that convey differential and common-mode signals over the same differential channel. Noise-tolerant communication schemes use low-amplitude common-mode signals that are easily rejected by differential receivers, thus allowing for very high differential data rates. Some embodiments employ the common-mode signals to transmit backchannel signals for adjusting the characteristics of the differential transmitter. Backchannel control signals are effectively conveyed even if the forward channel transmitter is so maladjusted that the received differential data is unrecognizable. Systems in accordance with the above-described embodiments obtain these advantages without additional pins or communications channels, and are compatible with both AC-coupled and DC-coupled communications channels. Data coding schemes and corresponding data recovery circuits eliminate the need for complex, high-speed CDR circuits.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.