Patent 7936212 was granted and assigned to Wolfspeed on May, 2011 by the United States Patent and Trademark Office.
A power amplifier circuit includes an unequal power splitter that splits an input signal using an unequal power split and provides a first power level signal and a second power level signal. A first amplifier path includes a first transistor amplifier that amplifies the first power level signal, and a second amplifier path includes a second transistor amplifier that amplifies the second power level signal. The second transistor amplifier is configured to turn on at a different power level of the input signal than the first transistor amplifier. An unequal combiner combines the amplified first power level signal and the amplified second power level signal.