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Allegro impedance calculation

Hello,

I have an issue with Allegro calculating the impedances. I have followed this tutorial: https://www.youtube.com/watch?v=XKVQPEIeRT0 but I am getting wrong values. Even if I put same values for cross section as he has in 0:40, mine values for trace thickness with same impedances (and vice versa) are approx. 40 times bigger: https://imgur.com/a/5ktfCpb.

I am assuming there is another settings somewhere which influence this but I am not able to find it. Can someone please help me with this problem?

Thank you in advance.

I am using OrCAD PCB Designer Professional 16.6-2015 S060

Wild over 5 years ago

So which layer is your plane?
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redwire over 5 years ago

You are not properly marking the reference plane as "PLANE", instead you are marking all layers as "CONDUCTOR". The Allegro tool is as accurate as any tool in the market -- just set it up correctly.
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Sulmaz over 5 years ago

Thank you so much guys! I never doubted Allegro, I just did not know what I set wrong. Now everything works flawlessly!
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