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SPICE models of resistors, inductors and capacitors are implemented as complex passive equivalent circuits in specialized industrial CAD packages developed by international and domestic companies. They often contain up to a dozen or more elements to achieve the necessary accuracy in the UHF and higher frequency ranges. Thus, the complexity and the simulation time significantly increase. In this work compact π-shaped equivalent circuits for passive R, L, C elements were proposed for calculating the frequency characteristics of PCB based circuits in UHF frequency range. In contrast with conventional multi-section equivalent circuits, the application of the introduced equivalent circuits has simplified the description complexity of the analyzed circuit and reduced computational time in CAD. A special test fixture containing calibration elements was fabricated for a set of standard discrete R, L, C component packages. The fixture was used to de-embed parasitic components and losses in cables, coaxial-to-microstrip launches and transmission lines from the measured S-parameters of the R, L, C components. S-parameters were converted into Y-parameters with standard formulas. The element values of the proposed π-shaped equivalent circuits for the R, L, C components were extracted from Y-parameters. The developed models were integrated into Keysight ADS, DeltaDesign, LTspice and OrCAD circuit simulators.

Key words: UHF range, SPICE simulation, passive electronic components, CAD
Published in: CIRCUIT ENGINEERING AND DESIGN
Bibliography link: Petrosyants K. O., Kazachkov A. O., Kremlev I. E. Compact equivalent circuits of discrete passive electronic components of radio-electronic equipment for calculating circuits frequency characteristics in the UHF range. Izv. vuzov. Elektronika = Proc. Univ. Electronics. 2026;31(3):318–331. (In Russ.). DOI: 10.24151/1561-5405-2026-31-3-318-331.WYHHUK
Financial source: the work was carried out within the framework of the Basic Research Program at HSE University in 2025 (project no. FI-2025-4).

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UDK: 621.3.049.75
Publication type: Scientific article
Source lang: Russian
DOI: 10.24151/1561-5405-2026-31-3-318-331
RISC id: WYHHUK

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