Affiliation: | 1. Aristotle University of Thessaloniki, Dept. of Electrical and Computer Eng., Electronics Lab., Thessaloniki 54124, Greece;2. Micro and Nanotechnology Group (MNT), Dept. of Enginyeria Electrnica, Universitat Politecnica Catalunya, Barcelona, Spain;3. University of Balearic Islands, 07122 Palma, Balears, Spain |