A.S. Oleinik – Dr. Sc. (Eng.), Professor, Department «Electronic Instruments and Devices», 

Yuri Gagarin State Technical University of Saratov

M.A. Medvedev – Student, Department «Electronic Instruments and Devices», 

Yuri Gagarin State Technical University of Saratov

E-mail: medmixal@yahoo.com

Ya.V. Turkin – Post-graduate Student, Department «Electronic Instruments and Devices», 

Yuri Gagarin State Technical University of Saratov

E-mail: turkin.yaroslav@gmail.com