layout cross section

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neena

Joined: 06 Feb 2006
Posts: 77
Helped: 5
Location: pluto

20 Feb 2006 8:18 layout cross section

hi

i am working with a four layer board
and the gap between the inner layer should be 2mm gap
how much did i have to give the thickness of dielectric
Is there any standard values to be assign

thank u
regards.......

Rame

Joined: 23 Dec 2005
Posts: 369
Helped: 40
Location: BANGALORE

21 Feb 2006 3:46 Re: layout cross section

Hi Neena,

If you are talking about controlled impedance board,then you need to tell the pcb fabricators regarding the Board Impedance(like 75 100ohms etc).Rest fabricator will take care.Hope this will help you.And you can ask any fabricators for information.Hitech in bangalore may provide details your looking for...

Regards

Rame

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binu G

Joined: 09 Jan 2003
Posts: 739
Helped: 9
Location: Bangalore

23 Feb 2006 6:09 Re: layout cross section

normally the impedence requirement will define the spacing of the layers.
if impedence is not an issue then u can select ur own option.
i have attached one option here, also it depend on the fabricator too.

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neena

Joined: 06 Feb 2006
Posts: 77
Helped: 5
Location: pluto

23 Feb 2006 7:38 Re: layout cross section

hi

if impedance is not an issue
and i want the board thickness of 2mm
with copper foil thickness of 2oz
how to choose FR4 values

if for controlled impedance
how and what values to be used

regards
........