Affiliation: | 1. Department of Electrical Engineering , Federal Center of Technological Education of Minas Gerais , Av. Amazonas 7675, 31510-470, Belo Horizonte, MG, Brazil;2. Department of Mathematics , Federal University of Minas Gerais , Av. Ant?nio Carlos 6627–31270-010, Belo Horizonte, MG, Brazil;3. Department of Electronics Engineering , Federal University of Minas Gerais , Av. Ant?nio Carlos 6627, 31270-010, Belo Horizonte, MG, Brazil |