[SI-LIST] Re: Power Supply impedance simulations
- From: Istvan Novak <istvan.novak@xxxxxxx>
- To: codymiller@xxxxxxxxxx
- Date: Mon, 19 Jan 2009 15:53:39 -0500
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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