[SI-LIST] : via capacitance

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From: Sunil Kumar (sunilb@cdotb.ernet.in)
Date: Thu Mar 30 2000 - 21:34:00 PST


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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