Aspect ratio setting

[kshirsagar564]

Hello everyone!

I have following questions for you:-

1) I am getting a DRC error "Blind via ratio". I have attached the layer stack up for your reference. My manufacturer says thickness to diameter ratio <=8. To remove this error what should i write in the DRC->sizes-> min blind via ratio. Currently it is set to 0.5 by default.

2) I have a very dense PCB with space constraints. I have to connect lot of smd signals from top to bottom. Can you suggest a 6 layer stack up equation (with blind, microvias and buried vias) that you have already completed successfully as HDI?

My board size :- 80x80mm

components :-700(containing 0805, 1206,2512 smd packages)

test points:- 50

[kshirsagar564 · Accepted solution]

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@kshirsagar564 wrote:

Hello everyone!

I have following questions for you:-

1) I am getting a DRC error "Blind via ratio". I have attached the layer stack up for your reference. My manufacturer says thickness to diameter ratio <=8. To remove this error what should i write in the DRC->sizes-> min blind via ratio. Currently it is set to 0.5 by default.

I came across the capability section for one of the manufacturer. It mentioned thickness/diameter ratio as 8 i.e 1:8. So I put 8 in the  DRC->sizes-> min blind via ratio and issue was solved!!!