[SI-LIST] Re: PCB thickness
- From: steve weir <weirsi@xxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Sat, 02 Feb 2013 06:01:56 -0800
Changing thickness changes the impedance for given line widths or
polygon sizes. Common practice to achieving impedance targets and
overall thickness is to adjust the thickness as needed in: where they
occur Vss / Vss cavities, and where Vss/Vss cavities do not occur:
Vdd/Vss, and Vddx/Vddy cavities.
Steve.
On 2/1/2013 10:17 PM, Hithesh wrote:
> Hi,
> What is the impact of changing PCB thickness?
> To cut a long story short, the PCB fab house we use said they can't meet
> our impedance requirement and achieve board thickness of 1.6mm.
> They have to reduce the board thickness to 1.13mm to meet impedance
> requirement.
> He did say they could achieve both when we sent them the stack up pdf. But
> now they said they can't take decisions just based on stack up.
>
> Regards
> -Hithesh
>
>
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