Input circuit of television tuner in which interference...

Details Input circuit of television tuner in which interference... Input circuit of television tuner in which interference...

2007-03-13

2007-03-13

Tran, Trang U. (Department: 2622)

Television

Receiver circuitry

Television receiver adapted to receive radio broadcast or in...

C348S731000, C348S725000

Reexamination Certificate

active

10811698

ABSTRACT:
An object of the present invention is to switch a television signal or an FM broadcasting signal by a small number of active elements, to input the switched television signal or FM broadcasting signal to an input tuning circuit, to reduce loss in the television signal when the television signal is received, and to reduce interference due to the FM broadcasting signal when the television signal is received.According to the present invention, an the first input terminal1is connected to the input end6aof the input tuning circuit6, first and second diodes15and14are serially connected between the second input terminal11and the input end6aof the input tuning circuit6and are simultaneously switched on or off, the first diode15is input to the input end6aof the input tuning circuit6, the second diode14is provided at the side of the second input terminal11, an inductance element12is interposed between the second input terminal11and the second diode14, and a first capacitance element17that forms a low pass filter together with the inductance element12in a state when the second diode14is switched on, is connected between the connection point of the first diode15and the second diode14and a ground.

REFERENCES:
patent: 6342928 (2002-01-01), Ohira
patent: 6344881 (2002-02-01), Endo
patent: 6351294 (2002-02-01), Yamamoto et al.
patent: 6914639 (2005-07-01), Yamamoto et al.
patent: 11-008562 (1999-01-01), None

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