A method and a circuit for high-efficiency linear RF-power amplification over a wide range of amplitudes from zero to peak output includes a final RF-power amplifier operating at or near saturation, an RF driver amplifier, a high-level amplitude modulator for the final amplifier, preferably a high-level...http://www.google.de/patents/US6256482?utm_source=gb-gplus-sharePatent US6256482 - Power- conserving drive-modulation method for envelope-elimination-and-restoration (EER) transmitters
