A printed circuit board includes a differential pair of transmission lines. The differential pair of transmission lines includes a first signal transmission line and a second signal transmission line. The first signal transmission line includes a first via and a second via. The second transmission line includes a third via and a fourth via. A first distance between a center of the first via and a center of the third via is equal to a first value. A second distance between a center of the second via and a center of the fourth via is equal to the first value. A third distance between the center of the first via and the center of the second via is equal to a second value. A fourth distance between the center of the third via and the center of the fourth via is not equal to the second value.