Analysis of Signal Integrity and Distortion in Twisted Pair in a Multilayer Printed Circuit Board

One of the areas of information security of electronic systems is the physical protection of information. Includes techniques for maintaining the integrity of electrical information signals in electronic systems at the physical level and reducing electromagnetic emissions. Differential transmission of electrical signals is one of the most promising areas for building high-speed electronic systems from the point of view of physical information protection. To transmit such signals on printed circuit boards, a differential pair are used - two transmission lines with a strong coupling between them. In practice today, each line is a conventional coplanar, stripline, or microstrip transmission line. This article discusses a new type of communication lines on printed circuit boards in the form of twisted pairs. Structurally, the twisted pair is implemented in two layers of a multilayer printed circuit board using vias. The article analyzes distortions of information signals in connections of multilayer printed circuit boards in the form of twisted pairs. The results are compared with the distortion of information signals in coplanar interconnects.