An improved power re-use technique is introduced for application to outphased microwave power amplifiers. The technique allows a significant portion of the wasted out-of-phase components of the signal to be returned to the power supply, resulting in substantial improvements in overall power-amplifier efficiency. A peak re-use RF-to-DC efficiency of 63% was obtained at 1.96 GHz. Index Terms-linear power amplifiers, LINC, outphasing amplifiers. Robert Langridge (S'83-M'86) was born in Cedar

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... , IA, on December 4, 1963. He received the B.S. degree in electrical engineering from Iowa State University, Ames, in 1986, and is currently working toward the M.S. degree in electrical engineering at the University of California at San Diego, La Jolla. From 1995 to 1997, he was with Glenayre Electronics Inc. Quincy, IL, where he was involved in the RF front-end design of high-dynamic-range low-noise receivers for 900-MHz two-way paging systems. From 1993 to 1994, he was with Sciteq Electronics Inc., San Diego, CA, where he was involved with phase-locked loop (PLL) frequency synthesizers for various applications, which included the fractional-N techniques. From 1987 to 1993, he was with IFR Systems Inc., Wichita, KS, where he was involved with several RF and analog design projects related to communication service monitors and general-purpose spectrum analyzers, including an RF signal generator, various frequency synthesizer projects, and spectrum-analyzer IF design. From 1986 to 1987, he was with Boeing Military Airplane Company, Wichita, KS, where he was involved with digital and RF circuit design and analysis. He holds one patent. Mr. Langridge is a member of Eta Kappa Nu.