Nuno C.C. Lourenço is a Post-Doctoral Researcher in the Integrated Circuits group, within the Instituto de Telecomunicações in Lisbon, Portugal. Ricardo M. F. Martins is a Post-Doctoral Researcher in the Integrated Circuits group, within the Instituto de Telecomunicações in Lisbon, Portugal. Nuno C. G. Horta is Professor at Instituto Superior Técnico from University of Lisbon and Senior Researcher in the Integrated Circuits group, within the Instituto de Telecomunicações in Lisbon, Portugal.