RE: [SI-LIST] : via capacitance

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From: Dunbar, Tony (Tony_Dunbar@mentorg.com)
Date: Sun Apr 02 2000 - 09:32:03 PDT


Sunil,

I believe you will find that the Greenfield modeling and simulation software
from Quantic Labs in Winnipeg, Canada would handle this sort of problem.
It's been quite a while since I used those tools (6-7 years, at least), but
they did have both 2-D and 3-D varieties of this tool . I think one of their
basic training modules covered an example similar to your case.

Regards,
Tony Dunbar

-----Original Message-----
From: Sunil Kumar [mailto:sunilb@cdotb.ernet.in]
Sent: Thursday, March 30, 2000 11:34 PM
To: si-list@silab.eng.sun.com
Subject: [SI-LIST] : via capacitance

Dear all SI experts.

I am using a multilayer board having the following stack-up:

LAYER1 TOP LAYER (CONDUCTOR)
LAYER2 GND
LAYER3 CONDUCTOR
LAYER4 CONDUCTOR
LAYER5 VCC
LAYER6 GND
LAYER7 CONDUCTOR
LAYER8 CONDUCTOR
LAYER9 GND
LAYER10 BOTTOM LAYER (CONDUCTOR)

A signal trace is going from layer7 to layer8. A through-hole via is used.
The via is having pads on layers 1,7,8,10. There are antipads on the power
planes. Is there any formula/tools to calculate the exact capacitance of
the via?? How can I measure it in the board??

Sunil Kumar
Research Engineer
C-DOT
INDIA

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