![]() In a circuit where edge rates change slowly, you can think of the energy flowing through the routing like water through a pipe. When a signal has fast edges, it changes the way that the energy travels through the routing. A signal with a fast edge can also radiate from the route and couple into adjacent routes, or radiate further and become electromagnetic interference (EMI), resulting in the product failing to meet mandatory emission standards. In this situation the signal can be reflected back to the source pin, degrading or destroying the original signal data. A design is a high-speed design when it includes devices with fast edges - devices that switch state so quickly that the transition is complete before the signal can travel along the route and reach the target pin. So exactly what makes a PCB design a high-speed design? Sure it’s about things happening quickly, but it’s not just about the clock rate used on the board. Refer to the References section for links to these authors, and the papers used during research for this article. This article does not attempt to provide a complete discussion of high-speed design for that, there are a number of highly experienced and scholarly designers and engineers that have written excellent reference papers and books on the subject. ![]() The purpose of this article is to introduce the key elements of high-speed design and then discuss how each of those elements is tackled in Altium Designer.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |