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12L HDI stackup

milos.stankovic , 09-06-2016, 05:37 AM
Hi all,

I am trying to find stackup which would be similar to stackup No 3 on http://www.fedevel.com/welldoneblog/...your-projects/. This stackup was used on Advanced PCB Layout Course. To complete Lesson 3, I have to do all track impedance calculation on similar stackup. Since I am having troubles finding similar stackup (12Layers, uVias, buried Vias etc), I need some alternative stackup. I suppose that only difference will be dielectric used.

robertferanec , 09-06-2016, 11:01 AM
Hello Milos, why can not you use one of the stackups from the article?
milos.stankovic , 09-06-2016, 02:59 PM
Ok, I'll do that. Thanks
milos.stankovic , 09-13-2016, 09:58 AM

I calculated stackup using http://www.fedevel.com/welldoneblog/...-12-Layers.pdf. I checked all the impedances. They definitely calculated impedances on L3 and L10 using only base copper weight (18 um).
robertferanec , 09-13-2016, 04:41 PM
Hi @milos.stankovic, please could you be more specific? Something doesn't look correct? I believe, the suggested stackup should be the one which was suggested by the PCB manufacturer. But Martin can confirm it, I will double check.
robertferanec, 09-15-2016, 11:44 AM
Martin confirmed, that this stackup was used and the numbers should be correct. If you have any specific questions / calculations let me know. We have got the numbers for PCB manufacturer, so they may be a little bit different comparing to the theoretical numbers.
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