Patent ID: 7901998
Filing Date: 2011-03-08
Classification: H01L,H05K,Y10T

Abstract:
1. A method of generating a matched pair of a first pattern for a front metal interconnect layer and a second pattern for a back metal interconnect layer for a packaging substrate, said method comprising: providing a first prototype pattern for said front metal interconnect layer and a second prototype pattern for said back metal interconnect layer; establishing a conformal one-to-one mapping between said first prototype pattern and said second prototype pattern; comparing said first prototype pattern and said second prototype pattern for complexity between regions correlated by said conformal one-to-one mapping; and identifying a pattern of higher complexity in one of said regions and superposing said pattern of said higher complexity to the other of said regions to generate a modified pattern for at least one of the front and the back metal interconnect layers to provide a matching 3D distribution of coefficient of expansion of the corresponding front and back metal interconnect layers.