Nested feedback for offset cancellation in a wireline receiver
US11509338B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 17, 2021 |
| Grant date | Nov 22, 2022 |
| Priority date | — |
| Expiry date | Mar 17, 2041 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/123
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Systems and methods are provided for optimizing offset compensation in a receiver with multiple offset compensation D/A converters. At each stage where offset cancellation is applied, there is a fan-out of two or more. At the final stage, comparator offset compensation codes are summed and compared against a digital reference. In one version the digital reference is zero. A second implementation has a non-zero digital reference which is the sum of comparator offsets stored from start up. The difference between the sum of offsets and digital reference is applied to a digital accumulator. The most significant bits of the digital accumulator are applied to a digital D/A converter, which cancel analog offsets in an intermediate stage of amplifiers. The summation of offsets feeding into an accumulator is implemented for all preceding stages.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.