Method and apparatus to correct for in-phase and quadrature-phase gain imbalance in communication circuitry
US6490326B1 · kind B1 · utility
11Cited by
5References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 4, 1999 |
| Grant date | Dec 3, 2002 |
| Priority date | — |
| Expiry date | Aug 4, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2027/0024
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Communication apparatus (100) corrects for amplitude imbalance caused by differences in circuitry that process in-phase and quadrature signals. The in-phase and quadrature signals are alternately routed in rapid succession through first and second parallel processing circuits or signal paths (140, 150) to cancel imbalances between the signal paths. Switches (132, 134) are employed at inputs to and outputs from corresponding portions of both signal paths, and these switches (132, 134) are synchronously operated in response to a control signal to interchange signals on the signal paths.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.