Method and apparatus for calibrating a filter of a receiver
US7577413B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 19, 2006 |
| Grant date | Aug 18, 2009 |
| Priority date | — |
| Expiry date | Feb 15, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B17/21
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
According to a disclosed method, a calibration signal is provided at a first frequency corresponding to a low frequency edge of a desired passband to an input of a filter (240). A first value is measured at an output of the filter (240). The calibration signal is provided at a second frequency corresponding to a high frequency edge of the desired passband to the input of the filter (240). A second value is measured at the output of the filter (240). The first value is compared to the second value. A characteristic of the filter (240) is changed in response to the comparing. In one form, the filter is an IF filter (240) and a receiver (200) includes both the IF filter (240) and a calibration circuit (250) for forming the calibration signal and providing the calibration signal to the IF filter to change the characteristic in response to a calibration operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.