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Generic load-pull-based design methodology for performance optimisation of doherty amplifiers

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3 Author(s)
R. Darraji ; iRadio Laboratory, ECE Department, Schulich School of Engineering, University of Calgary, 2500 University Drive NW, Calgary, AB, Canada T2N 1N4 ; F. M. Ghannouchi ; O. Hammi

In this study, a systematic design methodology is proposed to optimise the operation of Doherty power amplifiers (PAs). The proposed approach makes use of two sets of load-pull data to enhance the performance of Doherty PAs at low- and high-power-drive levels. The first load-pull, which is performed on the device operating at saturation, permits one to maximise the performance at a high-power region. The second load-pull, which is performed at the power level associated with the turn-on of the peaking amplifier, aims to boost the performance at back-off. To assess its effectiveness, the proposed methodology is applied to design three Doherty PAs sought for power efficiency, linearity and gain, respectively. Around the Doherty turn-on point, these circuits achieved up to 9% efficiency improvement, up to 10%dB inter-modulation reduction and up to 2%dB gain improvement, respectively. For experimental validation, a gallium-nitride (GaN)-based Doherty PA prototype sought for efficiency was implemented. The fabricated Doherty PA demonstrated a power-added efficiency (PAE) higher than 40% over an output power back-off (OPBO) range of 8%dB, with two peak PAE points of 52 and 62% located at 6.8%dB OPBO and at saturation, respectively.

Published in:

IET Science, Measurement & Technology  (Volume:6 ,  Issue: 3 )