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WWAN solution of NB display interface through silicon-package-board co-design

In addition to wireless local area network (WLAN), a wireless wide area network (WWAN) provides an alternative manner for people to connect to the internet with much larger coverage, achieved using cellular tower technology. For a typical notebook (NB) design with built-in WWAN feature, the WWAN antennas are usually located in the top or two sides of the display panel and thus susceptible to the conductive/radiative coupling of digital display signal. This paper takes advantage of the silicon-package-board (SPB) signal integrity/power integrity (SI/PI) co-simulation methodology to find out the root cause of WWAN problems as well as provide chip- and system-level solutions with real measurement validation.