Title: Single conversion tuner
Application Number: 200510069601 Application Date: 2005.04.29
Publication Number: 1694349 Publication Date: 2005.11.09
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: H03D7/00
Applicant(s) Name: Thomson Licensing GmbH Address:
Inventor(s) Name: Armbruster Veit;Selz Alfred
Attorney & Agent: lu xiaozhang ma ying
Abstract:
    A single conversion tuner suitable for receiving RF signals having different requirements as to selectivity, linearity and image rejection is presented. Tuners of this kind are particularly useful for digital terrestrial as well as cable reception, where different modulation schemes require very high image rejection ratios on one hand and high linearity or pass band flatness on the other hand. The inventive tuner features a double-tuned tuneable filter in combination with an image reject mixer. The double-tuned filter provides excellent pass band flatness, while the image reject mixer provides a high intrinsic image rejection. The image rejection ratio of the combination of image reject mixer and tuneable filter is very high and fulfils the requirements of commonly used modulation schemes such as 8VSB, while the pass band flatness is compliant with the requirements for modulation schemes such as QAM.
Time: 11
<- Previous Patent:Integrated analog video receiver   |  Next Patent:Method and apparatus for a gain c... ->