Television tuner in which unnecessary radiation is reduced

Details Television tuner in which unnecessary radiation is reduced Television tuner in which unnecessary radiation is reduced

2005-06-27

2008-10-07

Tran, Trang U (Department: 2622)

Television

Receiver circuitry

Tuning

C348S725000, C348S733000, C348S554000

Reexamination Certificate

active

07432989

ABSTRACT:
A television tuner includes a first high-frequency circuit for receiving VHF-band television signals, a second high-frequency circuit for receiving UHF-band television signals, and an integrated circuit. The integrated circuit includes a first mixer, a second mixer, a first input terminal that is connected to an input terminal of the first mixer, and a second input terminal that is connected to an input terminal of the second mixer and that is adjacent to the first input terminal. The first high-frequency circuit is connected to the first input terminal, and the second high-frequency circuit is connected to the second input terminal through a switching diode. The switching diode is turned off when the VHF-band television signals are received and is turned on when the UHF-band television signals are received.

REFERENCES:
patent: 5122878 (1992-06-01), Heigl et al.
patent: 5815218 (1998-09-01), Maeda
patent: 6307600 (2001-10-01), Wink
patent: 6891575 (2005-05-01), Matsuura
patent: 2000-224007 (2000-08-01), None
patent: 2000-295539 (2000-10-01), None

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