| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a signal switching device capable of cost reduction by simplifying circuit configuration, and capable of adjusting gain of transmission and reception signals flexibly. <P>SOLUTION: The signal switching device (1) includes: a switch circuit (11) which has a common terminal (11a) and a first terminal (11b) to a third terminal (11d) and in which the first terminal (11b) to the third terminal (11d) can be connected and disconnected to the common terminal (11a) individually, and any two terminals in the first terminal (11b) to the third terminal (11d) can be simultaneously connected to the common terminal (11a); and a low noise amplifier (13) the input terminal of which is connected to the first terminal (11b) and the output terminal of which is connected to the second terminal (11c). The signal switching device changes its gain to a first gain obtained when the common terminal (11a) is connected to the first terminal (11b), a second gain obtained when the common terminal (11a) is connected to the second terminal (11c), and a third gain obtained when the common terminal (11a) is simultaneously connected to the first and the second terminals (11b, 11c). <P>COPYRIGHT: (C)2013,JPO&INPIT |
