| 摘要 |
PROBLEM TO BE SOLVED: To suppress signals except for a desired signal in input signals without giving influence to the desired signal in a filter circuit to be used for the receiver of digital radio communication or optical communication. SOLUTION: The inputted signals are supplied respectively to the first filter 23 having the characteristic of transmitting the desired signal and the second filter 24 having the characteristic of transmitting the signals except for the desired signal. The desired signal having passed through the first filter 23 is outputted outside and the total sum of the desired signal and the signals except for the desired signal having passed through the second filter 24 is fed back to each input of the first filter 23 and the second filter 24. Then, by adjusting the characteristic of the second filter 24, an interruption signal, etc., included in the inputted signal is suppressed on purpose.
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