| abstract |
A printed circuit board (PCB) includes a base substrate including upper and lower surfaces, a plurality of solder ball pads separately formed on the lower surface of the base substrate in a radial direction and forming one or more radial pad groups, a plurality of first traces respectively connected to the plurality of solder ball pads and extending to an inside of the radial pad group, and a plurality of second traces respectively connected to the plurality of first traces and extending to an outside of the radial pad group. |