Limitations of the Intra Pair Skew Measurements in Gigabit Range Interconnects

As demand for higher data rates grows, interconnect intra-pair skew specifications have become increasingly tighter, resulting in harder to control manufacturing processes and lower yield. However, in many cases the measured skew values do not correlate to high-speed performance of copper links. Our investigation of coupled and noncoupled differential pairs explains the limitations of the intra-pair skew measurements in gigabit range interconnects and suggests a good alternative to characterize imbalance of the differential high-speed interconnects.