| 摘要 |
PROBLEM TO BE SOLVED: To improve distortion compensation amount of a feedforward amplifier, that is provided to a base station or a repeater or the like in a mobile communication system, and commonly amplifies a multi-frequency signal. SOLUTION: An isolator 6, whose characteristic is approximated to an amplitude deviation of an amplitude frequency characteristic of a main amplifier 4, is inserted in the path of a delay line 5 of a distortion detection circuit 20 or an isolator 12, whose characteristic is approximated to an amplitude deviation of an amplitude frequency characteristic of an auxiliary amplifier 10, is inserted to a path of a delay line 11 of a distortion eliminating circuit 30 to improve a distortion compensation amount over the entire frequency. |
