A Doherty amplifier circuit is provided comprising a digital signal processor for producing separated amplitude and phase modulated waveforms, and a plurality of class E amplifiers in communication with the digital signal processor. Each of the amplifiers has an input for receiving signals corresponding...http://www.google.com/patents/US6396341?utm_source=gb-gplus-sharePatent US6396341 - Class E Doherty amplifier topology for high efficiency signal transmitters
