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  4. A 63-73 GHz GaN Power Amplifier with a Compact Power Combiner
 
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2023
Conference Paper
Title

A 63-73 GHz GaN Power Amplifier with a Compact Power Combiner

Abstract
A 63-73 GHz GaN power amplifier (PA) with four cascaded stages is presented. At the final stage, the outputs of two transistors are combined to produce a maximum output power of 29.6 dBm at 70 GHz, along with a good power added efficiency (PAE) of 17%. A compact 2-way power combiner based on a quadrature coupler is utilized, which comprises two coupled transmission lines (TL), with one TL having an open termination. Furthermore, this combiner is used for not only power combination but also impedance matching between its input and output ports by selecting a suitable coupling coefficient. The size of the 2-way power combiner used here is 84 × 300 μm2, and the size of the entire PA is 2.5 mm2. The power density per chip area is 364 mW/mm2, which is the second largest value reported in the literature. In addition, this PA achieves a large signal gain of 20 dB at the maximum output power, the highest reported value in the literature.
Author(s)
Bao, Mingquan
Ericsson Research, Ericsson AB
Cimbili, Bharath Kumar
Fraunhofer-Institut für Angewandte Festkörperphysik IAF  
Schwantuschke, Dirk  
Fraunhofer-Institut für Angewandte Festkörperphysik IAF  
Andersson, Kristoffer
Fraunhofer-Institut für Angewandte Festkörperphysik IAF  
Brückner, Peter  
Fraunhofer-Institut für Angewandte Festkörperphysik IAF  
Quay, Rüdiger  orcid-logo
Fraunhofer-Institut für Angewandte Festkörperphysik IAF  
Hansryd, Jonas
Ericsson Research, Ericsson AB
Mainwork
18th European Microwave Integrated Circuits Conference, EuMIC 2023  
Conference
European Microwave Integrated Circuits Conference 2023  
European Microwave Week 2023  
DOI
10.23919/EuMIC58042.2023.10288967
Language
English
Fraunhofer-Institut für Angewandte Festkörperphysik IAF  
Keyword(s)
  • GaN

  • E-Band

  • Power combiner

  • Power amplifier

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