| 摘要 |
PROBLEM TO BE SOLVED: To miniaturize a signal switching circuit by simplifying the constitution by reducing the number of diodes to be used. SOLUTION: This signal switching circuit is provided with the pairs of first to fourth diodes 5, 7, 15, and 17 which are respectively constituted of two serially connected diodes interposed between a first input terminal 1 and a first output terminal 3, between a second input terminal 2 and the first output terminal 3, the first input terminal 1 and a second output terminal 4, and the second input terminal 2 and the second output terminal 4 and the pairs of first to fourth capacity means 6, 8, 16, and 18 which are respectively connected between the connection of the respective pairs of diodes and ground. Then, the pair of the first diodes 5 or the pair of the second diodes 7 is selectively conducted, and the pair of the third diodes 15 or the pair of the fourth diodes 17 is selectively conducted. In this case, it is possible to constitute a low pass filter for allowing a corresponding first or second signal to pass by the residual inductances of the respective pairs of diodes which are turned into the conductive states and the respective capacity means.
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