Image calibration and correction for low-IF receivers
US8238865B2 · kind B2 · utility
1Cited by
3References
24Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 9, 2009 |
| Grant date | Aug 7, 2012 |
| Priority date | — |
| Expiry date | Sep 2, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/30
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Embodiments of a system for calibrating the image rejection of a receiver include an image-rejection correction circuit that modifies the gain and phase of a first channel of a baseband image signal. The image-rejection correction circuit may include a summing circuit and first and second variable-gain elements. In one implementation, a filter receives a corrected first channel from the image-rejection correction circuit and an unmodified second channel of the image signal, while a controller analyzes power measured at the output of the filter, and adjusts the variable-gain elements to reduce the power of the image signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.