Adaptive Multi-Band Multi-Mode Power Amplifier Using Integrated Varactor-Based Tunable Matching Networks. - W. C. Edmund Neo; Yu Lin; Xiaodong Liu; Leo C. N. de Vreede; Lawrence E. Larson; Marco Spirito; Marco J. Pelk; Koen Buisman; Atef Akhnoukh; Anton de Graauw; Lis K. Nanver (IEEE J. Solid State Circuits, 2006)