In Situ Waveform Measurements Within Doherty Power Amplifier Under Operational Conditions

authored by: Steffen Probst, Eckhard Denicke, Bernd Geck
Abstract: In this contribution, a gallium nitride-based 1 GHz Doherty amplifier with in situ waveform measurement capability is presented. With this measurement approach, the high frequency time-domain voltages and currents can be measured directly within the circuit. Therefore, directional couplers are integrated into the output matching network of the carrier and the peak amplifier. In contrast to other measurement techniques for investigating amplifiers under laboratory conditions, with this approach, a more in-depth investigation of realized power amplifiers can be carried out under operational conditions, e.g., for tuning. Especially, it is possible to characterize the interaction of the carrier and the peak amplifier. Hence, to the best knowledge of the authors the load modulation of a Doherty amplifier at the fundamental and the higher harmonics is measured for the first time.
Organisation(s): Laboratorium f. Informationstechnologie
Institute of Microwave and Wireless Systems
Type: Article
Journal: IEEE Transactions on Microwave Theory and Techniques
Volume: 65
Pages: 2192-2200
No. of pages: 9
ISSN: 0018-9480
Publication date: 06.2017
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Radiation, Condensed Matter Physics, Electrical and Electronic Engineering
Electronic version(s): https://doi.org/10.1109/TMTT.2017.2651809 (Access: Closed)
: Details in the research portal "Research@Leibniz University"

BibTeX

@article{192f04bc60a44c24974e84e59b6f4489,
title = "In Situ Waveform Measurements Within Doherty Power Amplifier Under Operational Conditions",
abstract = "In this contribution, a gallium nitride-based 1 GHz Doherty amplifier with in situ waveform measurement capability is presented. With this measurement approach, the high frequency time-domain voltages and currents can be measured directly within the circuit. Therefore, directional couplers are integrated into the output matching network of the carrier and the peak amplifier. In contrast to other measurement techniques for investigating amplifiers under laboratory conditions, with this approach, a more in-depth investigation of realized power amplifiers can be carried out under operational conditions, e.g., for tuning. Especially, it is possible to characterize the interaction of the carrier and the peak amplifier. Hence, to the best knowledge of the authors the load modulation of a Doherty amplifier at the fundamental and the higher harmonics is measured for the first time.",
keywords = "Doherty amplifier, high efficiency, in situ measurements, inverse class F, load modulation, nonlinear systems, power amplifier, time-domain measurements",
author = "Steffen Probst and Eckhard Denicke and Bernd Geck",
note = "Publisher Copyright: {\textcopyright} 2017 IEEE. Copyright: Copyright 2017 Elsevier B.V., All rights reserved.",
year = "2017",
month = jun,
doi = "10.1109/TMTT.2017.2651809",
language = "English",
volume = "65",
pages = "2192--2200",
journal = "IEEE Transactions on Microwave Theory and Techniques",
issn = "0018-9480",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
number = "6",
}