| 摘要 |
PROBLEM TO BE SOLVED: To obtain sufficient characteristics in an active filter even though a GB product of an operational amplifier is not sufficient. SOLUTION: An input signal is supplied to a noninverted input terminal of the operational amplifier Q41I through a resistor R41, and a capacitor C41 for feedback is connected between the inverted input terminal and the noninverted input terminal of the operational amplifier Q41I to constitute an active filter. Another resistor r41 is connected to the capacitor C41 in series. A product C41×r41 of a value of the capacitor C41 and the resistor r41 is set to GB=1/(C41×r41) in a GB product of the operational amplifier Q41I. COPYRIGHT: (C)2008,JPO&INPIT
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