Enhancing Signal Integrity in Cables: DVI to HDMI and Class-B Differential Signaling

摘要

Prior papers "Cat 5 Cable Modeling for DVI/HDMI Links" [2] and "Bit Error Rate and Signal Integrity for Cat-5 based DVI/HDMI links" [3] discussed modeling Cat-5 UTP cables and verification of the feasibility of binary or digital signaling for DVI/HDMI over long (25m) Cat-5e links. This paper discusses aspects impacting signal integrity of binary signals transmitted over Cat-5e cables as well as techniques to enhance the quality of signals transmitted. We look at DVI and HDMI specifications, and particularly, electrical specifications within, and identify aspects in the HDMI specification that improve upon DVI as it relates to high-speed signal transmission over long cables. We also introduce symmetric true-differential signaling, called Class-B Differential Signaling (CBDS), conceived, developed and implemented in 180mn CMOS by ComLSI, advancing the state of the art in differential signal transmission.