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Effects of discontinuities and technological fluctuations on the RF performance of BGA packages

: Ndip, I.; John, W.; Reichl, H.


Electronic Components, Assemblies, and Materials Association; Electronic Industries Alliance -EIA-; IEEE Components, Packaging, and Manufacturing Technology Society:
55th Electronic Components & Technology Conference 2005. Proceedings. Vol.2 : Lake Buena Vista, FL, USA, May 31 - June 4, 2005
Piscataway, NJ: IEEE Service Center, 2005
ISBN: 0-7803-8906-9
ISBN: 0-7803-8907-7
Electronic Components and Technology Conference (ECTC) <55, 2005, Lake Buena Vista/Fla..>
Fraunhofer IZM ()

The presence of discontinuities (e.g., vias, bends...) along a uniform signal path distorts the electromagnetic (EM) field pattern, resulting in signal integrity (SI) effects especially at RF/microwave frequencies. Such effects, which also arise when geometrical and material parameters of components in chips, packages and boards unexpectedly change during the fabrication process, may lead to a degradation of the system performance, if not accounted for at the genesis of the development process. In this work, we examine the effects of discontinuities and technological fluctuations on the radio frequency (RF) performance of ball grid array (BGA) packages. For this purpose, an equivalent circuit model of the complete signal path' in a BGA package was developed for frequencies up to 25 GHz. The impact of multiple bends and vias on the signal quality was studied using this model. Furthermore, effects of up to 30% variation in material and geometrical parameters of each package component on its electrical characteristics and on the RF performance of the entire package were also critically investigated using the wideband package model. Based on the results of these investigations, design guidelines which can then be applied at the beginning of the development process to reduce cost and time, were deduced.