A high-frequency power amplifier system including a plurality of individual amplifiers connected in parallel, the amplifiers including switching-driven FET's. A fixed drain voltage is applied to one amplifier and a variable drain voltage is applied to another amplifier through a section including a DC-DC...http://www.google.fr/patents/US6700440?utm_source=gb-gplus-shareBrevet US6700440 - High frequency power amplifier
