#$%^&*AU2010203036B220131031.pdf#####HIGH EFFICIENCY MICROWAVE AMPLIFIER Abstract Disclosed is an apparatus and method for operating a microwave amplifier (100) with improved efficiency and reduced harmonic emissions. The disclosed amplifier includes a variable rail voltage supply (125) and a variable input drive stage. A controller (110) continually monitors the amplifier output and adjusts the rail voltage and input drive signal to achieve high efficiency and low harmonic emissions. The amplifier may include a dynamic bias controller (320) configured to operate the gain elements (330) outside the linear region. Efficiencies of over 70% may be achieved by the disclosed amplifier. 2839902-11/9 60 40 32 30 20 Generator FIG.1
