| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem of a conventional signal switching circuit using a plurality of analog switches that there occurs a time interval both analog switches are simultaneously on upon signal switching to cause a large pulse and through current, resulting in malfunction of prestage circuits and post-stage circuits and resulting in fluctuations of electric potential on a power supply line followed by the deterioration of a signal to noise ratio. SOLUTION: A signal switching circuit of the present invention uses a plurality of switch circuits each equipped with analog switches and includes a switching control circuit for controlling the switch circuits such that after the one switch circuit is surely interrupted, the other switch circuit is connected. Use of the switching control circuit can prevent bad influences on the prestage circuits and the post-stage circuits and can suppress a through current, so that noise detouring to other circuits through a power supply and the ground can be prevented, ensuring the construction of a highly accurate circuit without lowering the performance of the other circuits. COPYRIGHT: (C)2009,JPO&INPIT
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