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Propagation Delay Analysis

hvihvelin

Hi Everyone,

I have a PCB that has very different propagation velocities on the outer layers (microstrip) vs the inner layers (stripline).

As a result, total etch length is not enough to satisfy my timing requirements...I need to know the propagation delay.

I have found from this video ( https://www.youtube.com/watch?v=jM_rpbFND18 ) , that I can measure propagation delay between pin pairs.

This is great -- but it's unclear what propagation velocity is being assumed.

Does PCB editor work out the propagation velocities for each layer using the stack-up?

Anyone know the answer? *Fingers crossed*

Thx.

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