System and method for providing a dual conversion tuner having a first IF filter without fixed center frequency
US7634243B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 19, 2002 |
| Grant date | Dec 15, 2009 |
| Priority date | — |
| Expiry date | Mar 14, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03J1/0008
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Disclosed are systems and methods which utilize a relatively low cost first IF filter in a dual conversion tuner circuit. A preferred embodiment first IF filter is provided using a filter arrangement having a relatively high tolerance. Accordingly, preferred embodiment systems are designed such that they can accommodate the range of first IF frequencies that the large tolerance filter may provide. One aspect of this accommodation may include providing a means by which the system may detect the location of the passband of the IF filter in the spectrum. Another aspect of the accommodation for the range of first IF frequencies may include adjusting the first IF frequency utilized by the dual conversion tuner to match the passband of the IF filter. Additionally or alternatively, the passband of the first IF filter itself may be tuned, such as to provide a passband more near a desired IF frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.