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Calculate impedance PCB tracks

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Hi all,

I have different results of calculation and I don't know which one is the right.

I'm trying to calculate the 50 Ohm impedance on L3,L4,L7,L8 of this stack-up:
stackup.jpg

Do I threat the L3,L4,L7,L8 as a Asymmetric Stripline?
what calculator should I use?
what is the width of 50 Ohm line on L3 if the Er=4.3?

Best Regards.
 

The Saturn PCB toolkit has been mostly suggested for similar purposes.

It should be noted that the traces on the said layers are no clean asymmetrical stripline because the impedance is affected by traces on the other signal layer. You get best results by defining orthogonal routing directions on the adjacent layers.
 

Another good software is from polar instruments i am using si9000. According to this calculator the line on L3 is 505um for 50 ohm.
 
From this layers stack-up,if the thickness of L2 to L3 is 150um,the width of line for 50ohm impedance on L3 should be 200um.
Myabe other layers stack-up adjust a little to reach the impedance.

PS:You can use SI8000/SI9000 software to calculate it.
 
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