| 摘要 |
PROBLEM TO BE SOLVED: To provide a signal switching circuit capable of simplifying wiring and reducing power consumption. SOLUTION: The voltage of an output terminal is switched to any arbitrary voltage by regulators 17 and 18, any one of regulators 17 and 18 is operated and only one of amplifier circuits 12 and 13 for amplifying received signals supplied by antennas 10 and 11 for polarized wave reception is operated so that a signal to be outputted to the output terminal can be switched while controlling the DC voltage of the output terminal. Then, any dedicated control line is not required for switching and wiring can be simplified. Further, since only one of amplifier circuits is operated for amplifying any one of received signals supplied by the antennas 10 and 11 for polarized wave reception, power consumption can be reduced. |
