D.D. Stoyanov - Post-graduate Student, Chair Dynamics of Electronic Systems, P.G. Demidov Yaroslavl State University. E-mail: dmdrstoyanov@gmail.com A.L. Priorov - Dr.Sc. (Eng.), Associate Professor, Chair Dynamics of Electronic Systems, P.G. Demidov Yaroslavl State University. E-mail: andcat@yandex.ru M.A. Dubov - Ph.D. (Eng.), assistant, Chair Dynamics of Electronic Systems, P.G. Demidov Yaroslavl State University. E-mail: michaeldubov@gmail.com