ASYMMETRIC DOHERTY POWER AMPLIFIER DESIGN

摘要

In essence, the Doherty PA architecture utilizes dynamic loading of a Class-B amplifier. The amplifier is designed to operate into a load that is favorable to high efficiency under low RF signal levels and conversely operate into a load favorable to high power under high RF signal levels. The dynamic loading is accomplished through the synthesis of virtual loads by means of a secondary amplifier based on instantaneous output power requirements.