| 摘要 |
PROBLEM TO BE SOLVED: To provide an active filter which operates even at a high frequency. SOLUTION: A signal current of a frequency component except a resonance frequency of a serial resonance means 310 is taken out by a current mirror means 320, and subtracted from an input signal current at a terminal 303. As a result, the signal current of the frequency component of the resonance frequency can be taken out from the input signal current. COPYRIGHT: (C)2005,JPO&NCIPI
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