RF CMOS Transmitter Front-end with Output Power Combiner

• Autor(a) principal: Fraústo, Rodrigo da Silva Mendes
• Data de Publicação: 2018
• Tipo de documento: Dissertação
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10362/50991
• topic: Class-D; RF power amplifier; CMOS; drain efficiency; radio-frequency; switching circuits; Domínio/Área Científica::Engenharia e Tecnologia::Engenharia Eletrotécnica, Eletrónica e Informática

In this thesis strategies to achieve a high efficiency RF front-end are studied and presented. A high efficiency Power Amplifier is also proposed and simulated. The applications for this type of designs are vast, but the main ones are in mobile transmission devices where the only power supply source available is a battery. In order to perform this thesis several topologies of power amplifiers were studied, and the decision fell to those based on a switching behavior. The reason for this decision was the need for high efficiency (it’s one of the main objectives). The Class-D power amplifier with its ideal potential efficiency of 100% has proven the most promising for implementation. The objectives for this thesis in terms of implementation were an efficiency of 20% and an output power of 0dBm. Finally, a power-combining technique was used to explore the potential of achieving high output power without affecting the efficiency.