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Summary: IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, VOL. 47, NO. 8, AUGUST 1999 1467
A Power Re-Use Technique for Improved Efficiency
of Outphasing Microwave Power Amplifiers
Robert Langridge, Member, IEEE, Todd Thornton, Peter M. Asbeck, Senior Member, IEEE,
and Lawrence E. Larson, Senior Member, IEEE
Abstract--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 ob-
tained at 1.96 GHz.
Index Terms--linear power amplifiers, LINC, outphasing am-
plifiers.
I. INTRODUCTION
THE out-phased power amplifier concept dates back to
the early 1930's as an approach for the simultaneous
realization of high-efficiency and high-linearity amplification
[1]. It has been revived recently for wireless communication
applications under the rubric of linear amplification with
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