Multi-pair differential lines printed circuit board common mode filter

摘要

Multi-pair differential lines printed circuit board common mode filters are generally described. In one embodiment, the apparatus includes a multi-layer printed circuit board, a first signal line and a second signal line forming a first differential pair on a first layer of the printed circuit board, a second differential pair on the first layer of the printed circuit board, and a common mode filter on a second layer of the printed circuit board, the common mode filter comprising an absence of a predominantly occurring dielectric material of the printed circuit board, the common mode filter spanning an area directly below at least a portion of both the first and the second differential pairs. Other embodiments are also described and claimed.

主权项

1. An apparatus comprising:
a multi-layer printed circuit board including a first dielectric material, wherein the first dielectric material is a most predominant of any dielectric materials of the multi-layer printed circuit board; a first signal line and a second signal line forming a first differential pair on a first layer of the printed circuit board; a second differential pair on the first layer of the printed circuit board; and a common mode filter on a second layer of the printed circuit board, wherein all of the first dielectric material is external to the common mode filter, wherein the common mode filter extends directly below a portion of the first differential pair and further extends directly below portion of the second differential pair.