1Department of Applied Electronics and Information Engineering, Polytechnic University of Bucharest, Bucharest, Romania
2Departamento de Ingineria Electrica, Universidad Nacional del Sur, Bahia Blanca, Argentina
3CONICET (Consejo Nacional Investigaciones Cientificasy Technicas), CONICET, Argentina
4Department of Electrical Engineering and Computer, University of California Berkeley, Berkeley, CA, USA
5Institute of Microelectronic Systems, Darmstadt University of Technology, Darmstadt, Germany