A RF power amplifier with the advantages of high output efficiency and a wide range of gain control is disclosed. By appropriately biasing the power transistor of the power-stage amplifier in the RF power amplifier, the power-stage amplifier functions as a class C amplifier. By varying the bias source...http://www.google.de/patents/US5942946?utm_source=gb-gplus-sharePatent US5942946 - RF power amplifier with high efficiency and a wide range of gain control
