Blind and buried vias

[Devi]

blind and buried guidelines

hi,

How to create blind and buried vias in pads power pcb? and how to use in the designs, what r the thing we shd take care when we r using these vias? r any doc related to that subject?

Thanks in advance.

Regards,
Devi

 

[prasannavenkatesh krishna]

Hi Devi
I didnt have pads with me, but i use Cadstar.I can give some general info on blind and buried vias
1.Buried Vias : They r used in between to layers.They r not visible from the top and bottom layers.

2.Blind Vias : As the name suggests they r closed from one end.They r used from the top layer to any one of the inner layers.For eg. from top layer to inner 4 layer (vcc) or from top layer to inner 2 layer. They r only visible from the top and not fom the bottom.

In Cadstar it is very easy to create them but i dont know abt Pads.

regards
Prasanna

 

[Devi]

Hi prasanna,
Thanks for your reply. Can you give any related documents (layout guidelines) to blind and buried vias? One more doubt if blind via comes only in even layer?

Regards,
Devi

 

[prasannavenkatesh krishna]

Hi devi,
As of now I dont have any documents regarding that,but will upload if i come across any.
It is not necessary that blind vias should come in even layer.Take this example
A four layer board layer structure is
layer 1 - Top electric
layer 2 - GND
layer 3 - VCC
layer 4 - Bottom electric.
We can assign blind vias between layers 1 & 2 and also between layers 1&3.

Hope this helps u.If ur willing to give ur mail id or messenger ID i can mail u some documents as I cannot upload here due to lack of bandwidth.

Regards
Prasanna

 

[IanP]

Check out this website:
"Blind and Buried Vias"
**broken link removed**

Regards,
IanP

 

[Devi]

Hi prasanna,

My e-mail id ------ devirangaraju@yahoo.co.in

Regards,
Devi