**Author details**

Cristian Ravariu1 \*, Elena Manea2 , Alina Popescu2 and Cătălin Pârvulescu<sup>2</sup>

\*Address all correspondence to: cristian.ravariu@upb.ro

1 Department of Electronic Device, Circuits and Architectures, Faculty of Electronics Telecommunications and Information Technology, "Politehnica" University of Bucharest, Bucharest, Romania

2 National Institute for Research and Development of Microtechnology – IMT Bucharest, Voluntari, Ilfov, Romania
