| 摘要 |
PROBLEM TO BE SOLVED: To provide a filter circuit capable of reducing activation time at power-on. SOLUTION: At power-on, respective switches SW1, SW2 are turned off and a capacitor Cfc is cut off from an operational amplifier AMP, thus starting up the voltage of an output terminal OUT sharply, and reducing activation time at power-on. Then, when the voltage of the output terminal OUT becomes stable completely, respective transistors SW1, SW2 are turned on. The filter circuit 10 composes an incomplete integral circuit in which a resistor Rfc is connected in parallel with the capacitor Cfc, thus securing filter characteristics regulated by the capacitor Cfc and respective resistors Ra, Rfc. COPYRIGHT: (C)2007,JPO&INPIT
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