| 摘要 |
In order to reduce capacitance of a feedback section of an operational amplifier provided in a semiconductor integrated device, an active filter of the present invention includes an operational amplifier in which a plurality of capacitive elements are connected between (i) an output terminal and (ii) an inverting input terminal or an input terminal. This arrangement does not require any special technique and amendment of an ordinary integrated circuit process. Further, this arrangement ensures small capacitance in the feedback section of the operational amplifier, while preventing deterioration in S/N ratio, and increases in switching noise and power consumption.
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