Cross talk measurement

Goal

Cross talk between signal-return loops:

In this lab we will use special board to explore two different interconnect approaches to see how their different geometries will affect the amount of cross talk between the aggressor and the adjacent victim signal return path.

The purpose of this lab is to understand the best measurement practice measure switching noise cross talk and to learn the best routing geometry that creates the lowest cross talk.

Background:

There are two important noise sources that arise because interconnects are not transparent:

1. switching noise in the power and ground distribution path

2. switching noise as cross talk between aggressor signals and victim signals.

In this lab we focus on switching noise as cross talk between multiple aggressor line a victim line. Aggressor line carries signal that couple to another path. A victim line is a signal return path on which we measure the crosstalk noise. The ground net does NOT act like an infinite sink of current with all ground conductors connected, distributing the return currents equally. It is best practice to refer to the ground conductor as the return conductor.

You can find the detail report here.