RF front-end technology for reconfigurable mobile systems

This paper provides an overview of RF-front-end architectures and technologies for future reconfigurable mobile systems (4G-systems). Aspects of the historic evolution of mobile communication systems are given at the beginning. With respect to re-configurability, three different system approaches are introduced and compared: switchable systems, systems with reusable components and systems with multifunctional components. Furthermore, front-end key components like low noise amplifiers, voltage controlled oscillators and mixers are treated, particularly with regard to reconfigurable systems.