Amplifier and amplification method

An amplifier (300) comprises: a first signal path comprising a first amplifier circuit (105A) configured to receive a first signal (RF1) having a frequency and having a variable phase and amplitude at the frequency; a second signal path comprising a second amplifier circuit (105B) configured to receive a second signal (RF2) having the frequency, where at least one of a relative phase and an amplitude of the second signal is fixed at the frequency; and a combiner circuit (106) configured to combine the outputs of the first amplifier circuit and the second amplifier circuit. 一种放大器(300)，包括：第一信号路径，包括第一放大器电路(105A)，该第一放大器电路被配置为接收具有频率并且在该频率处具有能变化的相位和幅度的第一信号(RF1)；第二信号路径，包括第二放大器电路(105B)，被配置为接收具有该频率的第二信号(RF2)，其中，第二信号的相对相位和幅度中的至少一个在该频率处是固定的；组合器电路(106)，被配置为组合第一放大器电路和第二放大器电路的输出。