Propagation Delay Formula
To calculate propagation delay, the time it takes for an electrical current to run from one pin to the other on your schematic, you simply divide the distance of the circuit by the propagation speed, also referred to as propagation velocity. To determine the propagation velocity you need an additional formula. The formula for calculating propagation velocity is to divide the speed of light (11.80285 in/nSec or 299.792458 mm/ns) by the square root of the dielectric constant, which for many PCBs is FR4, so 4.
Propagation delay is an important consideration for high-speed PCB design, and Altium Designer can help you manage it. Altium Designer lets you run digital and analog circuit simulations, so you can maintain signal integrity on your schematic and produce an error-free product more quickly.
In addition to helping you manage propagation delay, Altium Designer also helps you control:
The impact of vias
The properties and dimensions of board materials
The configuration and routing of differential pairs
The quantity and arrangement of the layer stack in multi-layer PCBs
Now that you know the formula for calculating propagation delay and just a few of the many features of Altium Designer, it’s time to consider a free trial of this modern, easy-to-use PCB design software. Request your trial today.