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The phenomenon of data jitter

Posted: 09 Jul 2010     Print Version  Bookmark and Share

Keywords:data jitter  differential components  video signal 

The transmission of serial-digital video above 1Gbit/s (as required by the DVI, HDMI and DisplayPort video-interface standards) has elevated the requirements for performance in the cables that connect PC and HDTV monitors. As a consequence, the traditional suppliers of analogue audio/video (A/V) cable must now learn the pitfalls already known to makers of datacom serial-digital differential cables (e.g. for Infiniband and PCIe at 2.5Gbit/s, CX4 at 3.125Gbit/s and FibreChannel at 4.25Gbit/s).

This article highlights the phenomenon of data jitter caused by conversions between differential and common-mode components of the video signal. It also exposes myths about intra-pair skew and proposes cable tests for the purpose of predicting jitter. Differential cables with good performance need not be expensive, just well balanced.

View the PDF document for more information.

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