Patent ID: 8199522
Filing Date: 2012-06-12
Classification: H05K

Abstract:
1. A printed circuit board, comprising: a first signal layer comprising an integrated circuit (IC), the IC comprising a power supply terminal; a second signal layer parallel to the first signal layer, comprising a filter and a first power supply wire; a first reference layer sandwiched between the first and second signal layers; a second reference layer sandwiched between the first reference layer and the second signal layer, and defining a void at least partially vertically overlapping with the first power supply wire; a first power supply via passing through the first and second signal layers, and the first and second reference layers, the first power supply via connected to the power supply terminal of the IC, while isolated from the first and second reference layers; and a second power supply via passing through the first and second signal layers, and the first and second reference layers, the second power supply via connected to the first power supply via through the first power supply wire, and connected to the first reference layer, while isolated from the second reference layer; wherein the filter comprises a power terminal connected to the first power supply via, and a ground terminal connected to the second reference layer; and wherein the void enables the first reference layer to function as a reference plane for the first power supply wire, to increase impedance of the first power supply wire.