Abstract:

Faced with the challenge of 25 Gbps signal transmission,digital system design and signal integrity engineers must pay attention to the critical issue of intrapair skew between differential pairs.Firstly,the cause of intra-pair skew between differential pairs is introduced. Secondly,effects of intrapair skew between differential pairs on signal integrity in 25 Gbps backplane are analyzed from frequency domain and time domain.At the same time,the margin of intra-pair skew between differential pairs for 25 Gbps signal transmission is evaluated by testbased channel simulation.Finally,the engineering treating methods are provided to reduce intra-pair skew between differential pairs.

Key words: intra-pair skew;signal integrity;channel simulation;skew margin