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Experimental Validation of a Four-Way Outphasing Combiner for Microwave Power Amplification

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3 Author(s)
Taylor W. Barton ; Massachusetts Inst. of Technol., Cambridge, MA, USA ; Joel L. Dawson ; David J. Perreault

This letter presents a 2.14 GHz, four-way power combining and outphasing system for high-power amplifiers such as those in radio basestations (RBS). The combiner is ideally lossless, and enables power control through load modulation of the power amplifiers (PAs). A discrete-component power combiner is designed and characterized, and combined with inverse Class-F PAs using GaN HEMT devices to develop a complete PA system. We demonstrate the effectiveness of the system over a range of outphasing control angles. This first-ever microwave implementation of the outphasing system has a peak CW drain efficiency of 68.9%, with efficiency greater than 55% over a 5.5 dB power range. It provides an average modulated efficiency of 57% for a W-CDMA signal with 3.47 dB peak to average power ratio (PAPR) at 42 dBm output power.

Published in:

IEEE Microwave and Wireless Components Letters  (Volume:23 ,  Issue: 1 )