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Minimum impedance question

Question asked by Marty Fouch on Mar 5, 2018
Latest reply on Mar 5, 2018 by Barry_Olney

I would think that the minimum impedance is the actual trace impedance on that layer when matched. I set the diff rule to 80 ohms.

The clocks below were set to 82 ohms differential but HL DRC is displaying 92.77 ohms on the outer layers. I read somewhere, in the information, that solder mask is not included although I loaded a stackup which does include solder mask in the layer definition. Anyway, that would only increase the impedance by about 3 ohms. Why is it reading high?

 

See Pic1

 

 

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