Near end and far end crosstalk reduction in high-speed signaling channel with periodical spiral resonator defected microstriplines in a high performance printed circuit board

Abstract

High-density interconnects in modern PCBs, especially in DDR5 technology, have exacerbated near-end crosstalk (NEXT) and far-end crosstalk (FEXT), degrading signal quality. In this research, proposed Periodical Spiral Resonators (PSRs) within signal lines to mitigate these issues. The spiral structure extends and twists signal paths, increasing electrical length and altering the electric field distribution, reducing mutual coupling between traces. Experimental validation shows significant signal quality improvement up to 10 GHz, with a 22.35 dB reduction in NEXT and 30.16 dB reduction in FEXT. Simulations reveal a 50.47% reduction in near-end crosstalk and an 87.72% reduction in far-end crosstalk when compared to existing techniques. Our approach holds immense potential for DDR5 memory modules, promising minimal NEXT and FEXT, and ensuring superior performance and reliability.