Broadband - - doherty amplifier circuit with an acute impedance absorption

摘要

A broadband - - doherty amplifier circuit comprises a main amplifier (100) which is adapted, in a linear mode of operation is to work, a peaking amplifiers (110), which is arranged to operate in a non-linear operating mode, and a doherty - combiner (130) which is directly connected to an output (102, 112) of each amplifier (100, 110) is connected, so that no output adaptation a directions in the path between the amplifier outputs (102, 112) and the doherty - combiner are. The doherty - combiner is set up, each amplifier (100, 110) to provide the same load impedance, if the two amplifier (100, 110) are conductive, i.e. enhance, and the main amplifier (100) to provide a modulated load impedance, if the peaking amplifiers (110) of the invention is not conductive, so that a variation of the of the main amplifier (110), the standing wave ratio of less than 5%, by way of a plurality of frequency bands, and / or of the peaking amplifiers (110) an impedance spreading in the switched-off state of 20 degrees or less by way of the plurality of frequency bands.