A.A. Shvachko – Post-graduate Student, Yuri Gagarin State Technical University of Saratov
E-mail: alexandr1899@gmail.com
A.A. Zakharov – Dr. Sc. (Eng.), Professor, Head of Department «Electronic Instruments and Devices», Yuri Gagarin State Technical University of Saratov
E-mail: zaharov@sstu.ru
