[SI-LIST] Re: Power Supply impedance simulations

Hi Cody,

If all what you need is static inner-plane capacitance of the 
power-ground PCB structure, you can
calculate it as a plate capacitance.  For a rectangular shape: 
C=eps_nul*eps_rel*A/d, where A is the Area, d is spacing between 
conducting planes.  For non-rectangular shape you can approximate with a 
number of smaller rectangular shapes to get a better approximation of 
the contours. 

With static plane capacitance the highest-frequency signature you can 
simulate is the antiresonance between the plane capacitance and 
inductances of bypass capacitors.

Regards,

Istvan Novak
SUN Microsystems

codymiller@xxxxxxxxxx wrote:
> Hi group,
>
> I am simulating decoupling capacitance /power supply impedances in a
> spice tool. I am using simple series RLC for my decoupling caps+ via
> inductance. My question for the group is how should I model inner-plane
> capacitance?
>
> Thanks,
> Cody
>
>
>   

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