V.V. Afanasiev - Dr. Sc. (Eng.), Professor, Department of Radioelectronic and Quantum Devices, Kazan National Research Technical University named after A.N. Tupolev. E-mail: vafv@reku.kstu-kai.ru
S.S. Loginov - Ph.D. (Eng.), Associate Professor, Department of Radioelectronic and Quantum Devices, Kazan National Research Technical University named after A.N. Tupolev. E-mail: sslogin@mail.ru