Advanced Millimeter-wave Doherty Power Amplifier Architectures for 5G Communications and Beyond

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dc.contributor.advisorChi, Taiyunen_US
dc.creatorZhang, Xiaohanen_US
dc.date.accessioned2024-08-30T16:21:19Zen_US
dc.date.created2024-08en_US
dc.date.issued2024-08-08en_US
dc.date.submittedAugust 2024en_US
dc.date.updated2024-08-30T16:21:19Zen_US
dc.descriptionEMBARGO NOTE: This item is embargoed until 2025-02-01en_US
dc.description.abstractMillimeter-wave (mmWave) wireless communication is moving to 5G and 6G to increase its data rate and channel capacity. In a wireless transmitter, power amplifier (PA) is widely considered to be the most critical building block, as it serves as the final stage and often dominates the overall transmitter efficiency and linearity. As a result, mmWave 5G and 6G require spectrum efficient modulation signals such as quadrature amplitude modulation (QAM), orthogonal frequency-division multiplexing (OFDM) together with carrier aggregation (CA) with a large peak-to-average power ratio (PAPR). Such high PAPR signals seldom operate at their peak power level. While a classic linear PA, such as a Class-AB PA, achieves its highest efficiency at the peak power, its average efficiency can drop significantly when handling these modulated signals with high PAPR. Therefore, it is necessary to develop PAs with efficiency enhancement techniques for back-off power while maintaining high linearity. Such advancements could significantly improve the average efficiency of PAs, especially when amplifying spectrum efficient modulated signals, making them better suited to meet the demands of modern wireless communication systems. Among various back-off efficiency enhancement techniques, Doherty PA architecture is one of the most popular approaches at mmWave frequency band due to its minimum digital computation overhead. Although significant research has been conducted on Doherty PA in the literature, it remains a challenge to design Doherty PAs with high power, high linearity, low loss, deep back-off efficiency enhancement, and over-GHz modulation bandwidth (BW). In this doctoral thesis, I will first give a brief introduction of PA design challenges at mmWave and some existing back-off efficiency enhancement techniques in chapter 1. Then, in chapter 2, I will present a review of the Doherty PA architecture, from its original invention to its modern CMOS implementations. I will also introduce a few uncommon interpretations of the Doherty architecture from different perspectives to facilitate a more intuitive understanding of its operation. Following this, in chapter 3-5, I will introduce three Doherty PA prototypes designed during my PhD study, aiming to address the power, efficiency, and bandwidth challenges for mmWave PAs. Finally, chapter 6 concludes this thesis and discusses some potential future research directions. Chapter 7 summarizes the publications and experiences of the author during the PhD.en_US
dc.embargo.lift2025-02-01en_US
dc.embargo.terms2025-02-01en_US
dc.format.mimetypeapplication/pdfen_US
dc.identifier.citationZhang, Xiaohan. Advanced Millimeter-wave Doherty Power Amplifier Architectures for 5G Communications and Beyond. (2024). PhD diss., Rice University. https://hdl.handle.net/1911/117781en_US
dc.identifier.urihttps://hdl.handle.net/1911/117781en_US
dc.language.isoengen_US
dc.rightsCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.subjectpower amplifieren_US
dc.subjectOFDMen_US
dc.subjectDohertyen_US
dc.subjectmillimeter-waveen_US
dc.subjectadaptive biasingen_US
dc.subjectback-off efficiency enhancementen_US
dc.subject5G NRen_US
dc.subjectmulti-way Dohertyen_US
dc.titleAdvanced Millimeter-wave Doherty Power Amplifier Architectures for 5G Communications and Beyonden_US
dc.typeThesisen_US
dc.type.materialTexten_US
thesis.degree.departmentElectrical and Computer Engineeringen_US
thesis.degree.disciplineEngineeringen_US
thesis.degree.grantorRice Universityen_US
thesis.degree.levelDoctoralen_US
thesis.degree.nameDoctor of Philosophyen_US
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