Thesis
Emerging wideband RF power amplifier circuit design
Washington State University
Master of Science (MS), Washington State University
05/2020
DOI:
https://doi.org/10.7273/000004238
Handle:
https://hdl.handle.net/2376/124973
Abstract
The power amplifier is one of the crucial blocks in the RF transmitter, which consumes most of the power. Thus, the high-efficiency power amplifier design is essential to reduce the system power loss, especially for cellular infrastructure and battery-powered handset devices. At the same time, the ever-increasing demand for higher data rates with the emerging 5G technology pushes the power amplifier to support higher bandwidth without sacrificing its efficiency, linearity, and output power. In this thesis, it starts from fundamental microwave components with novel characteristics and designs a high-performance novel power amplifier to support the wide operating band as well as high efficiency at back-off power. First, a complex load matched microstrip balun is designed, which is capable of providing matching at all the ports as well as enough isolation between its output ports. To prove the concept a prototype is fabricated and tested at 1 GHz frequency. The measurement and theory match well with each other. A novel Push-Pull power amplifier is designed by expanding the proposed balun theory. A thorough analysis is carried out to explore the limiting parameters for the wide bandwidth. Then, splitting and combining baluns are designed that follow the optimum impedance trajectory of the GaN RF power devices. A prototype for the wideband PPPA is fabricated and validated in the experiment. In another work, a load modulated sequential power amplifier (SPA) is proposed to boost the efficiency in the back-off and in the peak power range, which breaks the limitation of high efficiency at the single power range. With the GaN 10 W transistor devices, a 5 dB back-off SPA is proposed to feature high efficiency at peak power level. The electromagnetic simulation results show the results are in agreement with the proposed theory. A SPA is designed at a working frequency of 2 GHz, which provides more than 50 % drain efficiency and more than 10 dB of gain at both the peak and the back-off power level with a 200 MHz bandwidth.
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Details
- Title
- Emerging wideband RF power amplifier circuit design
- Creators
- Md Hedayatullah Maktoomi
- Contributors
- BAYANER ARIGONG (Advisor)
- Awarding Institution
- Washington State University
- Academic Unit
- Engineering and Computer Science (VANC), School of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University
- Identifiers
- 99900896420801842
- Language
- English
- Resource Type
- Thesis