1. Graduate Program in Electrical Engineering, Federal University of Minas Gerais, Belo Horizonte-MG, Brazil
2. Federal University of Itajubá, Itabira-MG, Brazil
3. Department of Electronics Engineering, Federal University of Minas Gerais, Belo Horizonte-MG, Brazil
4. Universidade Tecnológica Federal do Paraná, UTFPR, Cornelio Procópio-PR, Brazil