Crosstalk Analysis between Interconnects in High-Speed Server Packages

This paper discusses crosstalk analysis between interconnects in high-speed server packages. Over the last decade, the scaling of the CMOS transistors has enabled the design of microprocessors operating at multi-gigahertz frequencies. For meeting the high bandwidth demands and low-power requirements, digital technologies are quickly moving to gigabit data rate and sub-voltage range signaling levels. However, this higher speed performance comes at a price, which means that signal integrity becomes a significant portion of the design effort. Especially, crosstalk analysis between interconnects in high-speed packages has become critical for design optimization of signal interconnects in system. This paper investigates importance of crosstalk analysis for IBM's high-speed server packages. For an efficient crosstalk analysis between interconnects in highspeed digital systems, an IBM's internal tool called PATS (package analysis tool suite) was used to investigate crosstalk over 1000 signal nets. The ISNRR (integral of squared noise ramp response) method has been developed to quantify crosstalk accurately and used to analyze IBM's organic modules for high-speed applications.