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PCB trace capacitance

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[quote][i]Originally posted by patrickhsia[/i]
[br]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?
[/quote]

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T O P I C R E V I E W
patrickhsia	Posted - Jul 08 2014 : 01:19:26 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?
3 L A T E S T R E P L I E S (Newest First)
Enrico	Posted - Jul 09 2014 : 12:06:59 Please check the white paper "The Maxwell Capacitance Matrix" under the 'literature' section. Best Regards, Enrico
patrickhsia	Posted - Jul 08 2014 : 14:18:40 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
patrickhsia	Posted - Jul 08 2014 : 02:24:43 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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