Patent ID: 7919804
Filing Date: 2011-04-05
Classification: H01L,H05K

Abstract:
1. An electronic assembly, comprising: a circuit board; an integrated circuit attached to a top side of the printed circuit board; a plurality of decoupling capacitors connected to the top side of the printed circuit board around a perimeter of the integrated circuit, the plurality of decoupling capacitors providing charge current to the integrated circuit; a via fence surround the plurality of decoupling capacitors; a first ground layer disposed below a bottom side of the circuit board; a power layer disposed below the first ground layer; a second ground layer disposed between the first ground layer and the power layer, the second ground layer extends widthwise between the via fence; the circuit board including an inner dielectric layer comprising (i) a first material having a dielectric constant of approximately 12.5, and (ii) a second material having a dielectric constant of approximately 3; the second material extending heightwise between a bottom side of the second ground layer and a top side of the power layer and widthwise between the via fence; and the first material surrounding the second material, the first material forming at least a volume extending heightwise between the first ground layer and the second ground layer and widthwise between the via fence.