A circuit structure combines an integrated circuit with a passive circuit element formed within a grid-array substrate. Formation of the circuit structure includes forming a passive circuit element within one or more conductive layers of a grid-array substrate such as may be used for packaging of integrated...http://www.google.se/patents/US6362525?utm_source=gb-gplus-sharePatent US6362525 - Circuit structure including a passive element formed within a grid array substrate and method for making the same