| 摘要 |
PROBLEM TO BE SOLVED: To provide a filter circuit capable of reducing influence of signal source impedance. SOLUTION: This filter circuit connectable to a signal source and having a low-frequency cutoff of 1/(R×C) 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; and a resistor circuit which is connected to an output end of the capacitor and has a resistance value of R. COPYRIGHT: (C)2009,JPO&INPIT
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