| 摘要 |
PROBLEM TO BE SOLVED: To provide a high frequency synthesizing circuit for reducing the circuit scale and contributing to the cost reduction of a transmission apparatus by decreasing the number of detectors in the case of carrying out transmission output control of different frequencies. SOLUTION: Amplifiers 5, 6 amplify power of frequency signals. A synthesizer 9 composes the signals amplified by the amplifiers 5, 6. A detector 8 measures an output power of the synthesizer 9. An attenuator 3 attenuates an input power to the amplifier 5. An attenuator 4 attenuates an input power to the amplifier 6. A control unit 12 controls the attenuation amount of the attenuators 3, 4 respectively on the basis of a result of the measurement by the detector 8. COPYRIGHT: (C)2006,JPO&NCIPI
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