The main objective of this project is to study the feasibility of incorporating digital techniques in wireless power amplifiers. For that, it will address both the system level concepts of transmitter architectures as the Polar, Cartesian and the LINC; and the implementation level of switching RF power amplifiers and their bias modulation control. So, this objective can be decomposed into: 1 - Investigate non-conventional wireless power amplifier and transmitter architectures that can bypass the traditional compromise between power added efficiency, efficient spectral usage and linearity. 2 - Identify the practical limits of bias-modulated digital power amplifiers in Cartesian and Polar transmitters in terms of (i) requirements imposed on the RF power devices by bias-modulated switching operation (ii) parasitic AM-to-PM modulation, (iii) class-D AM amplifier bandwidth, (iv) zero bias RF carrier leakage (zero-AM off-set), (v) AM envelope modulation linearity and (vi) time-delay mismatch between the AM and PM modulation paths.
|Start Date: 01-01-2009|
|End Date: 01-06-2012|
|Team: José Carlos Esteves Duarte Pedro, Pedro Miguel da Silva Cabral, João Manuel Torres Caldinhas Simões Vaz, Pedro Nuno Mendonça dos Santos, Telmo Reis Cunha|
|Groups: Wireless Circuits – Av, Wireless Circuits – Lx|
|Local Coordinator: José Carlos Esteves Duarte Pedro|