| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem due to capacity between terminals of a semiconductor switch in an amplifying device using the semiconductor switch. SOLUTION: The amplifying device is provided with an operational amplifier, the semiconductor switch which selectively connects at least one circuit to an input terminal of the operational amplifier and a means which temporarily shorts both ends of the semiconductor switch in an interruption state. An inverse amplifying device is provided with an operational amplifier, a semiconductor switch whose one end is connected to an inverse input terminal of the operational amplifier and a means setting potential of the other end of the semiconductor switch in the interruption state to be the same as that of a non-inverse input terminal of the operational amplifier. COPYRIGHT: (C)2005,JPO&NCIPI
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