1. Department of Civil and Environmental Engineering, Universidad de Los Andes, Bogota 111711, Colombia
2. Department of Electronic Engineering, Universidad CESMAG, Pasto 520002, Colombia
3. Institute of Microelectronics of Barcelona IMB-CNM (CSIC), Cerdanyola Del Vallès, 08193 Barcelona, Spain
4. Department of Electrical and Electronics Engineering, Universidad de Los Andes, Bogota 111711, Colombia