1. Graduate Program in Electrical Engineering, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
2. Institute of Technological Sciences, Universidade Federal de Itajubá, Itabira, Minas Gerais, Brazil
3. Department of Electronics Engineering, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
4. Department of Electrical Engineering, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil