B.K. Sivyakov – Dr.Sc.(Eng), Professor, 

Department «Electrical Engineering and Electronics », Yuri Gagarin State Technical University of Saratov E-mail: sibokon@rambler.ru

D.B. Sivyakov – Ph.D.(Eng), Associate Professor, 

Department «Electrical Engineering and Electronics », Yuri Gagarin State Technical University of Saratov E-mail: SivyakovDB@gmail.com