Direct current offset cancellation for mobile station modems using direct conversion
US6985711B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 2, 2002 |
| Grant date | Jan 10, 2006 |
| Priority date | — |
| Expiry date | Jun 13, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/30
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A system and method for canceling DC offset for Mobile Station Modems having direct conversion architectures. The present invention is a fast acquiring DC offset cancellation block that provides rapid and accurate DC offset estimates and cancellation techniques to support direct conversion architectures. The fast acquiring DC offset cancellation block combines four mechanisms to rapidly acquire and remove a DC offset estimate after power up, temperature changes, receiver frequency changes, and gain setting changes by increasing high pass loop bandwidth and adjusting DC offset levels at baseband. After removing the DC offset in large portions, the high pass loop bandwidth is decreased to fine tune the previous estimate and to remove any small variation in DC offset due to receiver self-mixing products.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.