| 摘要 |
PROBLEM TO BE SOLVED: To provide a method by which the interference wave superimposed upon a desired signal wave can be removed with a relatively simple circuit configuration, without using any additional circuit exclusively used for fetching offsetting error signals nor requiring complicated control circuits for uniting two independent error signals with each other. SOLUTION: Carrier frequency power inputted to a receiving input terminal 5 is divided into two parts by means of a distributor 7 and the parts are respectively supplied to first and second phase detectors. The low-frequency components outputted from the first phase detector are inputted to a weighting circuit 3, and compensate power 10 is obtained by controlling the carrier frequency power component which is in phase with first local oscillating power 12. The low-frequency component outputted from the second phase detector is inputted to another weighting circuit 4, and compensating power 11 is obtained by controlling the carrier frequency power component, which is in phase with second local oscillating power 13. An interference wave component is removed by combining the two compensating powers 10 and 11 and the carrier frequency power inputted to the input terminal 5 by means of a combining unit 6.
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