| 摘要 |
PROBLEM TO BE SOLVED: To further reduce the number of circuit components and miniaturize circuit scale by sharing the transmission and reception of an active circuit that is a non-reciprocative circuit, and also to reduce power consumption. SOLUTION: An amplifier 33 is arranged between a frequency conversion circuit 31 composed of the non-reciprocal circuit and a high-frequency filter 32 via first and second change-over switches 34, 35. Then, the first and second change-over switches 34, 35 are changed and controlled by a change-over control signal SW1 generated from a control unit 40, thus connecting the frequency conversion circuit 31 to the input end of the amplifier 33 and connecting the output end of the amplifier 33 to the high-frequency filter 32 in a transmission slot period. Contrarily, in a reception slot period, the high-frequency filter 32 is connected to the input end of the amplifier 33, and the output end of the amplifier 33 is connected to the frequency conversion circuit 31. COPYRIGHT: (C)2004,JPO&NCIPI
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