| 摘要 |
There is provided signal node for receiving a signal, a reference node having a reference voltage, an operational amplifier having an input terminal and an output terminal, a first capacitor, and a second capacitor equivalent in capacitance to the first capacitor connectable by a combination of switches responsive to a control signal for connecting the first capacitor between the signal node and the reference node and the second capacitor between the input terminal and the output terminal of the operational amplifier, and to an inverted signal of the control signal for connecting the second capacitor between the signal node and the reference node and the first capacitor between the input terminal and the output terminal of the operational amplifier, the control signal and the inverted signal thereof being complementary to each other so as to be alternately effective.
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