Mixed-Mode Distributed Physical-Based Model on OSFP Connector for Fast PAM-4 Channel Analysis and Pathfinding up to 212.5 Gbps

Advanced mixed-mode distributed physical-based transmission line (mm-dPBTL) model is developed for fast PAM4 signal-integrity (SI) diagnosis on high-speed connectors. This model includes loading effects with mated boards, resultant resonant structures, signal stubs, and ground cavities. The model accurately predicts mixed-mode S-parameters of the Octal Small Form Factor Pluggable (OSFP) connector up to 60 GHz. Multipair differential mode (DM) and common mode (CM) S-parameters (Sdd, Scc, Sdc) are captured by equivalent DM and CM dPBTLs with baseline couplings. The resonance mechanisms of crosstalk and CM-DM mode conversion in field interactions are transformed into the equivalent dPBTL of the ground cavity coupled with DM and CM dPBTLs. The mm-dPBTL enables new connector designs for fast PAM-4 channel simulation, analysis and pathfinding up to 212.5 Gbps for 1.6TbE system operations.