| 摘要 |
One aspect of the embodiments utilizes a filter circuit which can be connected to a signal source has a low-frequency cutoff of 1/(RxC). The filter includes a buffer circuit which can be connected to an output end of the signal source and has an output impedance of R, and a capacitor which is connected to an output end of the buffer circuit in a floating state and has a capacitance of C/2. The filter includes a resistor circuit which is connected to an output end of the capacitor and has a resistance value of R.
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