Method of Termination with Absorbers for Far-End Crosstalk Measurements

The increasing demand for higher data rates in modern electronic systems has heightened the challenges of maintaining signal integrity, particularly in addressing farend crosstalk (FEXT). This paper presents a novel approach using absorber-based terminations to perform signal integrity measurements in high-speed PCB designs. The performance of magnetically and electrically loaded absorber materials is evaluated against traditional 50Ω terminations with performance parameters such as S-parameters, Time-Domain reflectometry (TDR), and induced far-end crosstalk voltage. Simulations and experimental measurements demonstrate that electrically loaded absorbers can achieve performance characteristics comparable to high-quality terminations, particularly for reflections and impedance matching. The results indicate that absorbers offer a cost-effective and adaptable solution for termination applications, with the potential for fast application on existing PCB layouts. However, challenges remain in ensuring consistent pressure for optimal performance. The findings in this paper underlines the feasibility of absorbers for terminations.