Signal path linearizer
US10749716B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 23, 2018 |
| Grant date | Aug 18, 2020 |
| Priority date | — |
| Expiry date | Apr 23, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/03878
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A signal path linearizer for PAM4 SerDes communications compensates (including pre-compensates) for signal path nonlinearities. The linearizer can be configured with first and second differential gm stages, the first differential gm stage to provide a DC gain, and the second differential gm stage to introduce a defined nonlinear adjustment in DC gain by adding to or subtracting from the DC gain of the first differential gm stage. The differential gm stages can be configured to generate a compensated PAM4 signal with the combined DC gain providing a nonlinear wideband gain adjustment to compensate for nonlinearities in the PAM4 signal path. Compensation range can be increased by selective degeneration, and the compensation region can be shifted by selectively introducing input offset(s).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.