Input circuit of television tuner

Details Input circuit of television tuner Input circuit of television tuner

2006-11-21

2006-11-21

Tran, Trang (Department: 2622)

Television

Receiver circuitry

Tuning

C348S733000, C455S188200, C455S180200

Reexamination Certificate

active

07139039

ABSTRACT:
A VHF tuning circuit includes two tuning inductance devices connected in series with each other and having a junction thereof connected to an input terminal, and a first switch diode connected in parallel with the two in series inductance devices, and turned OFF at least when tuning is performed with a low range of a VHF band. A UHF tuning circuit is connected to the input terminal through a second switch diode that is turned ON at least when tuning is performed with a UHF band. The second switch diode is turned OFF when tuning is performed with a low range of the VHF band.

REFERENCES:
patent: 4710737 (1987-12-01), Matsuta
patent: 4771332 (1988-09-01), Metoki
patent: 4905306 (1990-02-01), Anderson
patent: 6351294 (2002-02-01), Yamamoto et al.
patent: 6842198 (2005-01-01), Suzuki et al.
patent: 6933984 (2005-08-01), Yamamoto et al.
patent: 0 348 697 (1990-01-01), None
patent: 1 047 192 (2000-10-01), None
patent: 1 213 837 (2002-06-01), None
patent: 2002-171185 (2002-06-01), None

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