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A Method of Optimizing Characteristic Impedance Compensation Using Cut-Outs in High-Density PCB Designs
Vaidotas Barzdenas1, Aleksandr Vasjanov1
1Department of Computer Science and Communications Technologies, Vilnius Gediminas Technical University, 03227 Vilnius, Lithuania.
Sensors (Basel, Switzerland)
|February 15, 2022
Summary
This study introduces an optimal method for impedance compensation in high-density printed circuit boards (PCBs). The research found that specific cut-out widths effectively compensate for characteristic impedance in high-speed digital interfaces.
Area of Science:
- Electrical Engineering
- Electromagnetics
- Materials Science
Background:
- Modern technology demands high-speed serial digital protocols and advanced microwave/RF components.
- Increasing data rates necessitate stringent hardware design, particularly for printed circuit boards (PCBs).
- Maintaining homogenous track impedance is critical for high-speed PCB interfaces to prevent signal degradation.
Purpose of the Study:
- To present an original method for determining optimal reference plane cut-out sizes.
- To achieve maximum characteristic impedance compensation in high-density multilayer PCB designs.
- To address signal integrity issues caused by component package land-pad discontinuities.
Main Methods:
- Theoretical estimation of impedance compensation.
- Electromagnetic computer simulations.
- Practical measurement verification on a 6-layer PCB.
- Analysis of track-to-discontinuity ratios (1:1.75, 1:2.5, 1:5.0).
Main Results:
- The proposed method effectively compensates for characteristic impedance discontinuities.
- Impedance compensation saturation was observed at cut-out widths of 150-250% for a 50 Ω microstrip.
- Simulations and measurements confirmed the theoretical findings.
Conclusions:
- The developed method provides an effective solution for impedance matching in high-speed PCB designs.
- Optimal cut-out dimensions are crucial for mitigating signal integrity issues in dense multilayer PCBs.
- This research contributes to the advancement of high-frequency hardware design and signal transmission.
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