Circuit for selectively outputting high frequency

专利名称：Circuit for selectively outputting high

frequency signals

发明人：Shuhei Kamada申请号：US07/225319申请日：19880728公开号：US04894720A公开日：19900116

摘要：When first high frequency signals from an antenna input terminal are selectedto be outputted, all transistors constituting first and second switch devices are turned offand a RF modulator is also turned off. Therefore, first high frequency signals aretransmitted to a TV output terminal through a first transmission line. When second highfrequency signals outputted from the RF modulator are selected to be outputted, the RFmodulator is turned on and transistors constituting the first and second switch devicesare turned on. Consequently, second high frequency signals are transmitted to the TVoutput terminal through a second transmission line. On this occasion, the transistorsconstituting the first switch grounds the first transmission line and form a parallelresonance circuit in the first transmission line. Therefore, the passage of the first highfrequency signals from the antenna input terminal is cut off and the reverse passage ofthe second high frequency signals and a harmonics component thereof from the secondtransmission line is prevented.

申请人：SANYO ELECTRIC CO., LTD.

代理机构：Armstrong, Nikaido, Marmelstein, Kubovcik & Murray

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