What is crosstalk and how to identify it with an oscilloscope?

Posted By : Lanna Cooper

What is crosstalk and why do I care about it? Crosstalk is interference on a signal from another signal. Any signal could interfere with another if a board layout is too crowded. Digital lines can disrupt power lines.

Power lines can disrupt digital lines. Digital can interfere with other digital signals. If signal traces are placed too close together they can interfere with each other causing noise or errors that could lead to malfunctions of your device.

Ideally, boards are designed to follow specific spacing standards. But as designs become more complex while form factors become more compact, we stretch the boundaries of layout constraints and experiment with new ways of routing signals.

Noise and errors can be caused by many different things, but if the cause is crosstalk, there’s usually a way to fix it. The traces need to be further spaced or rerouted across the board. Unfortunately, redoing a layout and then fabricating another board can be tedious and expensive. Before you go through the trouble, wouldn’t it be nice to measure and quantify crosstalk and understand the benefit of a redesign?

Without a tool to analyse crosstalk, it can be difficult, if not impossible to understand the impact of crosstalk.

In this episode you will learn how to set up eye diagrams and use the crosstalk tool to quantify crosstalk and model the improvement in design if you were to update it to remove the effects of crosstalk.


You must be logged in to comment

Write a comment

No comments




View & download Keysight product literature, application notes, specifications & brochures.

Literature

View & download Keysight technical support documentation, demos, manuals & selection/configuration guides.

Support

SINDEX 2018
28th August 2018
Switzerland BERNEXPO-Site, Bern
European Microwave Week 2018
23rd September 2018
Spain Ifema Feria De Madrid
Connected World Summit 2018
25th September 2018
United Kingdom Printworks, London
IoT Solutions World Congress 2018
16th October 2018
Spain Barcelona
Engineering Design Show 2018
17th October 2018
United Kingdom Ricoh Arena, Coventry