| 摘要 |
In a feed forward amplifier with a dual loop in which a distortion injection path of a distortion elimination circuit is provided as a feed forward configuration composed of a first auxiliary amplifier distortion elimination circuit and a first auxiliary amplifier distortion elimination circuit, a second variable attenuator and a second variable phase shifter 56 are provided preceding the distortion detection circuit 60, a second pilot signal injected between stages of a main amplifier 14 is detected by a directional coupler, and the second variable attenuator 5 5 and the second variable phase shifter are controlled by a second controller to minimize the level of the detected second pilot signal, thereby bringing the distortion elimination circuit and the first auxiliary distortion detection circuit into balance at the same time.
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