AMPLIFIER, RADIO COMMUNICATION APPARATUS AND CONTROL METHOD OF AMPLIFIER

To provide an amplifier capable of preventing performance degradation.SOLUTION: In a radio communication apparatus 101, an amplifier circuit 111 includes multiple amplifier circuits 31 where the inputs and outputs are connected in parallel, multiple directional couplers 1, 2 taking out the output signals from the multiple amplifier circuits, a phase shifter 3 for inverting the phase of a signal taken out from the first directional coupler 1 included in the multiple directional couplers, a synthesis circuit 4 for synthesizing the output signal from the phase shifter, and a signal taken out from a second directional coupler 2 included in the multiple directional couplers, and a gate bias operation part 8 for controlling the gate bias of at least one of the multiple amplifiers so that output signal from the synthesis circuit is minimized.SELECTED DRAWING: Figure 4 【課題】効率低下を防止できる増幅装置を提供する。【解決手段】無線通信装置１０１において、増幅回路１１１は、入出力が並列に接続される複数の増幅回路３１と、複数の増幅回路の各々の出力信号を取り出す複数の方向性結合器１、２と、複数の方向性結合器に含まれる第１方向性結合器１から取り出された信号の位相を反転させる移相器３と、移相器の出力信号と複数の方向性結合器に含まれる第２方向性結合器２から取り出された信号とを合成する合成回路４と、合成回路の出力信号が最小になるように複数の増幅器のうち少なくとも一つの増幅器のゲートバイアスを制御するゲートバイアス演算部８とを備える。【選択図】図４