[SI-LIST] Re: Current density per layer
- From: steve weir <weirsi@xxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Mon, 05 Nov 2012 00:10:59 -0800
The maximum value is the one that is limiting. If you are going to work
with a single number, the highest value is the one that will tell you if
you failed your specification.
In checking your model, you should see a noticeable difference in the
remaining layers when you add or remove a parallel layer that has
substantial copper pour. If the current density in pwr1 remained
constant at 1E7 A/m^2, I would go back and check the model.
Steve.
On 11/4/2012 11:05 PM, bala wrote:
> Hi all,*
> *I have some doubt on PCB current density.I have drawn my core voltage in
> multiple layers( for example 3 layers,top,pwr1,pwr2), i ran current density
> analysis,there were three different current density map for core
> voltage(one per layer).The overall density should be average of three
> layers?am i right?
>
> Both sigrity and sentinel shows maximum density among three layers as
> overall density.For example if Density in top layer is 0.5E7 A/m^2 , in
> pwr1 is 1E7,and in pwr2 is 1.2E7,the tool shows 1.2E7 as overall
> density,and if i remove the pwr2 layer and ran the simulation it was
> showing 1E7 as overall density. How come this will help for better PDN.
>
--
Steve Weir
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