RF and Microwave PowerHigh Frequency Design RF POWER AMPLIFIERS From January 2004 High Frequency Electronics Copyright Summit Technical Media, LLC RF and Microwave Power Amplifier and Transmitter Technologies ― Part 5 By Frederick H. Raab, Peter Asbeck, Steve Cripps, Peter B. Kenington, Zoya B. Popovich, Nick Pothecary, John F. Sevic and Nathan O. Sokal The ever-increasing demands for more bandwidth, coupled with requirements for both high linearity and high efficiency create everincreasing challenges in the design of power amplifiers and transmitters. A single W-CDMA signal, for example, taxes the capabilities of a Kahn-technique transmitter with a conventional class-S modulator. More acute are the problems in base-station and satellite transmitters, where multiple carriers must be amplified simultaneously……