Propagation Delay Calculation
The calculation to find propagation delay on your PCB requires the propagation velocity of a circuit and the distance the circuit must travel. To calculate the propagation velocity, you divide the speed of light (11.80285 in/nSec or 299.792458 mm/ns) by the square root of the dielectric constant of the material used on the PCB. FR4 is the most common dielectric material used on PCBs, and its dielectric constant is 4. With the measurement of the distance of your circuit, you can now calculate the propagation delay: divide that distance by the propagation velocity.
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