Patent ID: 9202783
Filing Date: 2015-12-01
Classification: H01L

Abstract:
1. A printed circuit board (PCB) comprising: a plurality of pads to connect a component to the PCB; a plurality of vertically disposed vias connected to at least some of the plurality of pads; a plurality of horizontally disposed signal layers that create a stair step pattern in the PCB and are electrically connected by the plurality of vertically disposed vias, a plurality of antipads formed in the plurality of horizontally disposed signal layers and around the plurality of vertically disposed vias, a first area formed by first backdrilling from a bottom of the PCB up to the first signal layers and through a first via of the plurality of vertically disposed vias; a second area formed by second backdrilling from the bottom of the PCB up to the second signal layers and through a second via of the plurality of vertically disposed vias; and a third area formed by third backdrilling from the bottom of the PCB up to the third signal layers and through a third via of the plurality of vertically disposed vias,