Patent ID: 8253031
Filing Date: 2012-08-28
Classification: H05K,Y02P

Abstract:
1. A printed circuit board (PCB) comprising: a first and a second layers; a high speed differential signal control chip; a first and a second connection components; a first, a second, and a third connector pads; a first to a eighth transmission lines, wherein the first and second transmission lines are connected to two output terminals of the high speed differential signal control chip, respectively, the third and fourth transmission lines are connected to two input terminals of the first connector pad, respectively, the fifth and sixth transmission lines are connected to two input terminals of the second connector pad, respectively, the seventh and eighth transmission lines are connected to two input terminals of the third connector pad, respectively; and a first and a second vias through the first layer and the second layer, wherein top ends of the first and second vias are operable to connect with the first and second connection components, respectively, and bottom ends of the first and second vias are connected to the first and second transmission lines, respectively; wherein the high speed differential signal control chip, the first, second, seventh and eighth transmission lines, and the third connector pad are located at the first layer, the third to sixth transmission lines, and the first and second connector pads are located at the second layer; upon a condition that a connector is installed on the first connector pad, one terminal of the first connection component is connected to the top end of the first via, the other terminal of the first connection component is connected to the third transmission line, one terminal of the second connection component is connected to the top end of the second via, the other terminal of the second connection component is connected to the fourth transmission line, the first transmission line is connected to the third transmission line through the first via and the first connection component, and the second transmission line is connected to the fourth transmission line through the second via and the second connection component; upon a condition that a connector is installed on the second connector pad, one terminal of the first connection component is connected to the top end of the first via, the other terminal of the first connection component is connected to the fifth transmission line, one terminal of the second connection component is connected to the top end of the second via, the other terminal of the second connection component is connected to the sixth transmission line, the first transmission line is connected to the fifth transmission line through the first via and the first connection component, and the second transmission line is connected to the sixth transmission line through the second via and the second connection component; and upon a condition that a connector is installed on the third connector pad, one terminal of the first connection component is connected to the first transmission line, the other terminal of the first connection component is connected to the seventh transmission line, one terminal of the second connection component is connected to the second transmission line, the other terminal of the second connection component is connected to the eighth transmission line, the first transmission line is connected to the seventh transmission line through the first connection component, the second transmission line is connected to the eighth transmission line through the second connection component.