1. Solid State Electronics Section, Department of Electrical Engineering, Center for Research and Advanced Studies of National Polytechnic Institute, CINVESTAV-IPN, 07360 Mexico City, Mexico
2. Sección de Estudios de Posgrado e Investigación, UPIITA, Instituto Politécnico Nacional, Mexico City 07340, Mexico
3. CONACYT – Center for Engineering and Industrial Development (CIDESI), Microtechnology Division – DIEE and DTEyP, 76125 Santiago de Querétaro, Querétaro, Mexico