V.E. Drach – Ph.D.(Eng.), Associate Professor, 

Kaluga branch of the Bauman MSTU

E-mail: drach@bmstu-kaluga.ru

P.V. Kondrashov – Master Student, 

Kaluga branch of the Bauman MSTU

E-mail: p.kondrashov.radio@yandex.ru

M.A. Savvin – Master Student, 

Kaluga branch of the Bauman MSTU

E-mail: 79108644148@yandex.ru

The article describes the principles of evaluating the design disadvantages of a noise-reduction filter. The characteristics of the developed equipment are influenced by many parameters, such as the inhomogeneity of the components used, the parasitic interference introduced by them, and noise induced from structural elements and external sources. At the same time, the search for and elimination of the reasons for the discrepancy between the parameters of the designed products requires more and more expenses during the development stages. That is why the problem of modeling equipment with parameters close to real ones and under conditions different from laboratory ones is urgent.

To assess the influence of the above factors in the Qucs 0.0.19 program, a noise suppression filter was simulated, the introduced attenuation of which did not meet the requirements of the design documentation (this problem was identified due to the use of modern measuring equipment at the stage of serial production). A family of curves is constructed that describe the behavior of the circuit for various values of the parameters of the elements. Equivalent circuits were used to assess the influence of parasitic parameters. The effect of noise induced by structural elements was approximated using parallel connected transformers in short circuit mode. The simulation was carried out in the frequency range from 100 Hz to 1 GHz. As a result of the conducted research, it was obtained: taking into account the parasitic parameters of the elements leads to a significant change in the form of the ideal frequency response of the noise suppression filter; the value of the capacitance of the pass capacitor in the considered frequency range does not make a significant contribution to the attenuation introduced by the filter; in the low-frequency region, the magnitude of the inductance of the coils has the greatest influence on the output characteristic of the filter; in the high-frequency region, the radiating properties of structural elements begin to appear, the influence of which on the attenuation introduced by the filter is significant. 

Drach V.E., Kondrashov P.V., Savvin M.A. Analysis of noise-reduction filter design by computer modelling. Science Intensive Technologies. 2020. V. 21. № 6. P. 19−27. DOI: https://doi.org/10.18127/j19998465-202006-04. (in Russian)

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