V.A. Tsarev – Dr.Sc.(Eng.), Professor, Department «Electronic Instruments and Devices», Yuri Gagarin State Technical University of Saratov

E-mail: tsarev_va@mail.ru

D.A. Nesterov – Post-graduate Student, Department «Electronic Instruments and Devices», Yuri Gagarin State Technical University of Saratov E-mail: enlucioro@gmail.com