[IEEE 2016 13th International Scientific-Technical Conference on Actual Problems of Electronics Instrument Engineering (APEIE) - Novosibirsk, Russia (2016.10.3-2016.10.6)] 2016 13th International Scientific-Technical Conference on Actual Problems of Electronics Instrument Engineering (APEIE) - Realization of excitation of anoscillating system with a fixed phase difference between the excitation signal and the response signal