Journal of Radio Electronics. eISSN 1684-1719. 2025. ¹4
Full text in Russian (pdf)
DOI: https://doi.org/10.30898/1684-1719.2025.4.13
Investigation of the influence
of transmission line routing methods
on their noise immunity in differential
and common-mode operation
S.V. Vlasov, M.S. Murmansky, Y.S. Zhechev
Tomsk State University of Control Systems and Radioelectronics
634050, Tomsk, Lenin pr., 40.
The paper was received January 23, 2025.
Abstract. The study focuses on analyzing the impact of differential transmission line routing techniques on their immunity to conducted electromagnetic interference (EMI) in differential and common-mode operations. Ensuring electromagnetic compatibility (EMC) remains a pressing issue as the demand for high-speed interfaces, such as LVDS, USB, and HDMI, continues to grow in modern electronic systems. The susceptibility of these devices to electromagnetic disturbances necessitates the development of new routing methods capable of effectively suppressing both ultra-wideband (UWB) and narrowband (NB) interference. The research methodology involves quasi-static and electrodynamic modeling of the temporal and frequency characteristics of transmission lines. Three conductor routing types were investigated—meander, spiral, and straight—with variations in the number of turns. The primary objective of the study is to determine optimal conductor routing schemes to enhance the immunity of differential transmission lines against UWB and NB interference. The results indicate that spiral routing with 9 turns is most effective in suppressing UWB EMI in differential mode, while straight routing demonstrates superior suppression of NB EMI in common mode. The minimum output voltage amplitude for UWB EMI is achieved with spiral routing featuring 9 turns, amounting to 0.089 V (with an input voltage of 0.5 V), whereas the lowest amplitude for NB EMI is observed with straight routing at 0.112 V. It was established that changing the number of turns in spiral or meander routing does not affect the cutoff frequency but does influence the average values of the transmission coefficient and input reflection coefficient.
Key words: differential mode, common mode, routing schemes, N-norms, microstrip line, time response, intentional electromagnetic interference, electromagnetic compatibility.
Financing: The study was conducted as part of the project FEWM-2024-0005 of the Ministry of Education and Science of Russia.
Corresponding author: Murmansky Mihail Semenovich, mihailmurmanskii@gmail.com
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For citation:
Vlasov S.V., Murmansky M.S., Zhechev Y.S. Investigation of the influence of transmission line routing methods on their noise immunity in differential and common-mode operation // Journal of Radio Electronics. – 2025. – ¹. 4. https://doi.org/10.30898/1684-1719.2025.4.13 (In Russian)