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High Frequency Power Amplifier for Wideband Wireless Communication Systems

  • Increasing data transmission rates and bandwidth both belong to the challenges of the development of high-performance wireless communication systems. Multi-channel communication systems commonly use several narrowband power amplifiers each one for a single communication channel. Lossy couplers are needed both to separate the different channels from each other at the amplifiers input and to combine the amplified signals on each channel at the output. This approach depicts a poor efficiency and is limited to a few number of channels since each channel duplication involves 3 dB losses due to couplers. Alternatively, broadband radio frequency power amplifiers ensuring the simultaneous transmission of several carriers on a wide frequency range contribute to increase the cost and resource efficiency of transceivers in wireless communication systems. Gain flatness, a high output power, and low power levels of second and third order harmonics are required on the whole operating frequency range of the power amplifier in multi-carrier communication systems since overtones will degrade the quality of the communication. The present work investigates the performances of a broadband push-pull power amplifier based on LDMOS transistors, the input matching network using a 8:1 transmission line transformer. For the first time investigations on harmonic distortions of the amplified signal when using a transformer with 8:1 impedance transformation ratio are presented. Characterisation of the power amplifiers performances is focused on gain flatness, output power, harmonic distortions and efficiency at 110 W.

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Metadaten
Author:Anne-Catherine Probst, Hans Hitzinger, Ulrich Bochtler, Maximilian Wölfel, Christoph Schmitt
DOI:https://doi.org/10.23919/IEEECONF54431.2021.9598443
Parent Title (English):Proceedings of the 2021 Kleinheubach Conference
Editor: U.R.S.I. Landesausschuss in Deutschland e.V. 2021
Document Type:Conference Proceeding
Language:English
Year of Completion:2021
Release Date:2022/01/11
Tag:LDMOS; broadband RF power amplifier; harmonic distortion; push-pull; transmission line transformer
GND Keyword:Hochfrequenzverstärker; Leistungsverstärker; Kommunikationssystem
Volume:2021
Page Number:4
Urheberrecht:0
Institutes:Fakultät Ingenieurwissenschaften / Labore / Schaltungstechnik
research focus :Intelligent Systems / Electronics and Electric Drives
Licence (German):Keine Lizenz - es gilt das deutsche Urheberrecht
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