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 PCB trace capacitance		  New Topic  Reply to Topic
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patrickhsia

United Kingdom
3 Posts
Posted - Jul 08 2014 :  01:19:26  Show Profile  Reply with Quote
Hi, my model is given as follows:

the bottom trace:
Q 1 0.00000 0.00000 0.00000 0.00500 0.00000 0.00000 0.00500 0.00500 0.00000 0.00000 0.00500 0.00000
Q 1 0.00500 0.00225 0.00000 0.04500 0.00225 0.00000 0.04500 0.00725 0.00000 0.00500 0.00725 0.00000
Q 1 0.04500 0.00000 0.00000 0.05000 0.00000 0.00000 0.05000 0.00500 0.00000 0.04500 0.05000 0.00000

the upper trace consists of two separated pieces:
Q 1 0.00000 0.00100 0.00000 0.00500 0.00100 0.00000 0.00500 0.00400 0.00000 0.00000 0.00400 0.00000
Q 1 0.00500 0.00000 0.00000 0.01000 0.00000 0.00000 0.01000 0.00500 0.00000 0.00500 0.00500 0.00000
Q 1 0.04500 0.00000 0.00000 0.05000 0.00000 0.00000 0.05000 0.00500 0.00000 0.04500 0.00500 0.00000
Q 1 0.05000 0.00100 0.00000 0.05500 0.00100 0.00000 0.05500 0.00400 0.00000 0.05000 0.00400 0.00000

Both the square parts of the upper trace is exactly on top of those of the bottom trace(like parallel plate). I am trying to figure out the the plate capacitance with the parasitic capacitance with voltage applied on the left upper trace and ground on the right upper trace. How can I do that?

patrickhsia

United Kingdom
3 Posts
Posted - Jul 08 2014 :  02:24:43  Show Profile  Reply with Quote
Sorry the model should be:

The bottom trace:
Q 1 0.00000 0.00000 0.00000 0.00500 0.00000 0.00000 0.00500 0.00500 0.00000 0.00000 0.00500 0.00000
Q 1 0.00500 0.00225 0.00000 0.04500 0.00225 0.00000 0.04500 0.00275 0.00000 0.00500 0.00275 0.00000
Q 1 0.04500 0.00000 0.00000 0.05000 0.00000 0.00000 0.05000 0.00500 0.00000 0.04500 0.00500 0.00000
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patrickhsia

United Kingdom
3 Posts
Posted - Jul 08 2014 :  14:18:40  Show Profile  Reply with Quote
I think I have got the correct structure now and I obtain the capacitance matrix:
CAPACITANCE MATRIX, femtofarads
1 2 3
1%GROUP1 1 950.4 -264.1 -264.1
1%GROUP2 2 -264.1 405.6 -3.258
2%GROUP2 3 -264.1 -3.258 405.6

How do I obtain those capacitances from it?

patrick
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Enrico

550 Posts
Posted - Jul 09 2014 :  12:06:59  Show Profile  Reply with Quote
Please check the white paper "The Maxwell Capacitance Matrix" under the 'literature' section.

Best Regards,
Enrico
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