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Efficient Linearization of Microwave Power Amplifiers
NAVAL RESEARCH LAB WASHINGTON DC ELECTRONICS SCIENCE AND TECHNOLOGY DIV
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The growing use of multiple-carrier, complex multi-level, multi-phase, spectrally efficient waveforms such as quadrature-amplitude-modulation QAM and code division multiple access CDMA in communication systems is placing a growing demand on the power efficiency and linearity of microwave power amplifiers. Continuing reliance on vacuum electronics amplifiers such as traveling-wave tube amplifiers TWTA in space-based transponders and ground terminals requires tube designers to constantly develop new techniques to improve the efficiency and linearity of devices. To satisfy performance requirements, there is an increasing trend of designers incorporating preor post-linearization modules with the power amplifiers to improve overall system efficiency and linearity.1 Signal predistortion is a simple and effective linearization technique that has been used successfully for both solid-state power amplifiers SSPA and TWTAs.
APPROVED FOR PUBLIC RELEASE