Power amplifier for 5G systems

• Autor(a) principal: Homem, Tiago Rafael Coimbras
• Data de Publicação: 2022
• Tipo de documento: Dissertação
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10773/39395
• topic: Power Amplifier; Radio-frequency; Transistors; Gallium nitride; Efficiency 5G

With the increased number of users and applications that use wireless communications, comes the need for better performance solutions. That is where 5G comes in, this new generation aspires to give higher data-rates and capacity, lower latency and higher efficiency while maintaining a reduced cost and good quality of experience. Because of the crowded spectrum below 3GHz, 5G has its eye on higher frequencies ranging from 3GHz up to to the 10s of GHz. In a wireless communication system, one of the last components is the Power Amplifier. While designing Power Amplifiers, simulation tools are used in order to help the engineers develop the hardware. However, these simulators, while being really helpful, only provide an approximation of the developed hardware, and this approximation is only as close to reality as the cautions that the engineer took. Having this in mind, and in order to better understand the differences of how devices and passive elements behave in simulations and the real world, in this dissertation the first step was to design a basic Power Amplifier, with the chosen frequency being 6GHz. In the first section of this work, the design of the PA, factors such as the Gain, Efficiency and Stability were taken into consideration. The next step was to identify the potential sources of error and divergences from the simulations. In order to do this, a few test boards were designed. This allowed for measurements to be taken and the passive elements characterized. Finally, with the conclusions taken from the measurements, it was possible to obtain a Power Amplifier which was consistent and close to the simulations. The tool used in this work was Advanced Design System(ADS) 2021, from Keysight Technologies, being a powerful tool it was used to simulate, design and optimize the PA.