The present invention provides a method and apparatus for supplying power to a load at a plurality of different power levels. The method includes changing between high and low power outputs of the power amplifier when amplifying a signal having a common modulation format. A different bias is applied...http://www.google.com/patents/US20040075494?utm_source=gb-gplus-sharePatent US20040075494 - Power amplification circuit and method for supplying power at a plurality of desired power output levels
