The present invention provides an apparatus and methods for the functionality of an integrated circuit. An exemplary embodiment according to an aspect of the present invention includes a ball grid array having open spaces therein. Within the open spaces, pairs of opposite polarity vias are clustered...http://www.google.com.au/patents/US7279356?utm_source=gb-gplus-sharePatent US7279356 - Depopulation of a ball grid array to allow via placement
