Telecommunications – Receiver or analog modulated signal frequency converter – Noise or interference elimination
Reexamination Certificate
2005-05-02
2008-12-16
Vuong, Quochien B (Department: 2618)
Telecommunications
Receiver or analog modulated signal frequency converter
Noise or interference elimination
C455S150100, C455S307000
Reexamination Certificate
active
07466973
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.
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patent: 6150891 (2000-11-01), Welland et al.
patent: 7236760 (2007-06-01), Cowley et al.
Wegerif S et al. “An integrated CMOS Image-Rejection Mixer System For Low-Jitter Secondary Frequency REferences” IEEE May 3-6, 1993 New York pp. 1010-1013 XP010115272.
Armbruster Veit
Selz Alfred
Cromarty Brian J.
Laks Joseph J.
Shedd Robert D.
Thomson Licensing
Vuong Quochien B
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