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Not converging of PCB model

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Sven

Germany
8 Posts

Posted - Oct 05 2020 : 12:55:20

Hello together,

after a while I am once again working on my PCB conversion tool to FH and FasterCap.
I created input files like I saw in this post (w*w.fastfieldsolvers.com/forum/topic.asp?TOPIC_ID=952), but FasterCap is not converging. It even looks like the results are getting worse with each iteration.

I am trying to model two wires of copper an top of a PCB and one GND-plane on the bottom of the PCB.
Dielectric constant of the PCB is 4.

I hope you guys can help me.

The input files are:

FC_input.lst
*FC Test

*GND
C GND.txt 1.0 0.0 0.0 0.000000 + 0xd8d8d8ff
C GND_sides.txt 1.0 0.0 0.0 0.000000 + 0xd8d8d8ff
C GND.txt 4.0 0.0 0.0 0.000035 0xd8d8d8ff

*PCB
D PCB.txt 1.0 4.0 0.0 0.0 0.0 0.0020 0.0020 0.0010 - 0xa793b4ff

*Mitte
C Mitte.txt 4.0 0.0 0.0 0.001635 + 0xd8d8d8ff
C Mitte_sides.txt 1.0 0.0 0.0 0.001635 + 0xd8d8d8ff
C Mitte.txt 1.0 0.0 0.0 0.001670 0xd8d8d8ff

*WireOut
C WireOut.txt 4.0 0.0 0.0 0.001635 + 0xd8d8d8ff
C WireOut_sides.txt 1.0 0.0 0.0 0.001635 + 0xd8d8d8ff
C WireOut.txt 1.0 0.0 0.0 0.001670 0xd8d8d8ff

GND.txt
0 GND

T 1 0.0018 0.0059 0.0 0.0164 0.0059 0.0 0.0018 0.0010 0.0
T 1 0.0018 0.0010 0.0 0.0164 0.0059 0.0 0.0164 0.0010 0.0

GND_sides.txt
0 GND_sides

Q 1 0.0018 0.0059 0.0000 0.0164 0.0059 0.0000 0.0164 0.0059 0.000035 0.0018 0.0059 0.000035
Q 1 0.0018 0.0059 0.0000 0.0018 0.0010 0.0000 0.0018 0.0010 0.000035 0.0018 0.0059 0.000035
Q 1 0.0018 0.0010 0.0000 0.0164 0.0010 0.0000 0.0164 0.0010 0.000035 0.0018 0.0010 0.000035
Q 1 0.0164 0.0010 0.0000 0.0164 0.0059 0.0000 0.0164 0.0059 0.000035 0.0164 0.0010 0.000035

PCB.txt
0 PCB

*BOTTOM

T 1 0.0008 0.0069 0.000035 0.0018 0.0069 0.000035 0.0009 0.0000 0.000035
T 1 0.0008 0.0000 0.000035 0.0018 0.0000 0.000035 0.0018 0.0069 0.000035
T 1 0.0018 0.0000 0.000035 0.0018 0.0010 0.000035 0.0164 0.0010 0.000035
T 1 0.0018 0.0000 0.000035 0.0164 0.0000 0.000035 0.0164 0.0010 0.000035
T 1 0.0164 0.0000 0.000035 0.0174 0.0000 0.000035 0.0174 0.0069 0.000035
T 1 0.0164 0.0000 0.000035 0.0174 0.0069 0.000035 0.0164 0.0069 0.000035
T 1 0.0164 0.0059 0.000035 0.0164 0.0069 0.000035 0.0018 0.0059 0.000035
T 1 0.0018 0.0069 0.000035 0.0018 0.0059 0.000035 0.0164 0.0069 0.000035

*TOM
T 1 0.0008 0.0069 0.001635 0.0069 0.0069 0.001635 0.0008 0.0000 0.001635
T 1 0.0008 0.0000 0.001635 0.0069 0.0000 0.001635 0.0069 0.0069 0.001635
T 1 0.0069 0.0045 0.001635 0.0091 0.0023 0.001635 0.0069 0.0023 0.001635
T 1 0.0069 0.0023 0.001635 0.0069 0.0000 0.001635 0.0109 0.0023 0.001635
T 1 0.0069 0.0000 0.001635 0.0109 0.0000 0.001635 0.0109 0.0023 0.001635
T 1 0.0109 0.0023 0.001635 0.0109 0.0000 0.001635 0.0174 0.0023 0.001635
T 1 0.0109 0.0000 0.001635 0.0174 0.0000 0.001635 0.0174 0.0023 0.001635
T 1 0.0109 0.0023 0.001635 0.0121 0.0023 0.001635 0.0121 0.0035 0.001635
T 1 0.0121 0.0023 0.001635 0.0124 0.0023 0.001635 0.0124 0.0069 0.001635
T 1 0.0121 0.0023 0.001635 0.0124 0.0069 0.001635 0.0121 0.0069 0.001635
T 1 0.0069 0.0069 0.001635 0.0121 0.0069 0.001635 0.0069 0.0055 0.001635
T 1 0.0069 0.0055 0.001635 0.0121 0.0055 0.001635 0.0121 0.0069 0.001635
T 1 0.0124 0.0023 0.001635 0.0124 0.0045 0.001635 0.0174 0.0045 0.001635
T 1 0.0124 0.0023 0.001635 0.0174 0.0023 0.001635 0.0174 0.0045 0.001635
T 1 0.0133 0.0045 0.001635 0.0133 0.0053 0.001635 0.0174 0.0053 0.001635
T 1 0.0133 0.0045 0.001635 0.0174 0.0045 0.001635 0.0174 0.0053 0.001635
T 1 0.0159 0.0053 0.001635 0.0174 0.0053 0.001635 0.0174 0.0069 0.001635
T 1 0.0159 0.0053 0.001635 0.0174 0.0069 0.001635 0.0159 0.0069 0.001635
T 1 0.0124 0.0055 0.001635 0.0159 0.0055 0.001635 0.0159 0.0069 0.001635
T 1 0.0124 0.0069 0.001635 0.0124 0.0055 0.001635 0.0159 0.0069 0.001635

*SIDES
Q 1 0.0008 0.0069 0.000035 0.0174 0.0069 0.000035 0.0174 0.0069 0.001635 0.0008 0.0069 0.001635
Q 1 0.0174 0.0069 0.000035 0.0174 0.0000 0.000035 0.0174 0.0000 0.001635 0.0174 0.0069 0.001635
Q 1 0.0174 0.0000 0.000035 0.0008 0.0000 0.000035 0.0008 0.0000 0.001635 0.0174 0.0000 0.001635
Q 1 0.0008 0.0000 0.000035 0.0008 0.0069 0.000035 0.0008 0.0069 0.001635 0.0008 0.0000 0.001635

Mitte.txt
0 Mitte

T 1 0.0069 0.0045 0.0 0.0121 0.0058 0.0 0.0069 0.0058 0.0
T 1 0.0069 0.0045 0.0 0.0121 0.0058 0.0 0.0121 0.0045 0.0
T 1 0.0069 0.0045 0.0 0.0091 0.0045 0.0 0.0091 0.0023 0.0
T 1 0.0091 0.0035 0.0 0.0121 0.0035 0.0 0.0091 0.0045 0.0
T 1 0.0091 0.0045 0.0 0.0121 0.0045 0.0 0.0121 0.0035 0.0
T 1 0.0091 0.0035 0.0 0.0109 0.0035 0.0 0.0091 0.0023 0.0
T 1 0.0091 0.0023 0.0 0.0109 0.0035 0.0 0.0109 0.0023 0.0
T 1 0.0109 0.0035 0.0 0.0121 0.0035 0.0 0.0109 0.0023 0.0

Mitte_sides.txt
0 Mitte_sides

Q 1 0.0069 0.0058 0.0000 0.0121 0.0058 0.0000 0.0121 0.0058 0.000035 0.0069 0.0058 0.000035
Q 1 0.0121 0.0058 0.0000 0.0121 0.0045 0.0000 0.0121 0.0045 0.000035 0.0121 0.0058 0.000035
Q 1 0.0121 0.0045 0.0000 0.0121 0.0035 0.0000 0.0121 0.0035 0.000035 0.0121 0.0045 0.000035
Q 1 0.0121 0.0035 0.0000 0.0109 0.0023 0.0000 0.0109 0.0023 0.000035 0.0121 0.0035 0.000035
Q 1 0.0109 0.0023 0.0000 0.0091 0.0023 0.0000 0.0091 0.0023 0.000035 0.0109 0.0023 0.000035
Q 1 0.0091 0.0023 0.0000 0.0069 0.0045 0.0000 0.0069 0.0045 0.000035 0.0091 0.0023 0.000035
Q 1 0.0069 0.0045 0.0000 0.0069 0.0058 0.0000 0.0069 0.0058 0.000035 0.0069 0.0045 0.000035

WireOut.txt
0 WireOut

T 1 0.0124 0.0055 0.0 0.0133 0.0045 0.0 0.0124 0.0045 0.0
T 1 0.0124 0.0055 0.0 0.0133 0.0055 0.0 0.0133 0.0045 0.0
T 1 0.0133 0.0055 0.0 0.0159 0.0055 0.0 0.0133 0.0053 0.0
T 1 0.0159 0.0055 0.0 0.0159 0.0053 0.0 0.0133 0.0053 0.0

WireOut_sides.txt
0 WireOut_sides

Q 1 0.0124 0.0055 0.0000 0.0124 0.0045 0.0000 0.0124 0.0045 0.000035 0.0124 0.0055 0.000035
Q 1 0.0124 0.0045 0.0000 0.0133 0.0045 0.0000 0.0133 0.0045 0.000035 0.0124 0.0045 0.000035
Q 1 0.0133 0.0045 0.0000 0.0133 0.0053 0.0000 0.0133 0.0053 0.000035 0.0133 0.0045 0.000035
Q 1 0.0133 0.0053 0.0000 0.0159 0.0053 0.0000 0.0159 0.0053 0.000035 0.0133 0.0053 0.000035
Q 1 0.0159 0.0053 0.0000 0.0159 0.0055 0.0000 0.0159 0.0055 0.000035 0.0159 0.0053 0.000035
Q 1 0.0159 0.0055 0.0000 0.0133 0.0055 0.0000 0.0133 0.0055 0.000035 0.0159 0.0055 0.000035
Q 1 0.0133 0.0055 0.0000 0.0124 0.0055 0.0000 0.0124 0.0055 0.000035 0.0133 0.0055 0.000035

Sven

Germany
8 Posts

Posted - Oct 19 2020 : 15:31:30

Hello again,

in the meantime I found a small typo in the D-file.
After correcting that mistake (the plane wasn't correctly closed), FasterCap still doesn't converge.

So I double checked each point and renamed the conductors (instead of naming each of it "1" as the last time).
Also I separated the D-file into Top, Bottom, and Sides like in the microstrip-example I appended in my last post.
I put the reference point for the dielectric on the outside (and left out the "-"-argument).

And still FasterCap does not converge.
Simulating it without the dielectric results in an answer in a matter of seconds. But when I include it, it looks like the results are getting worse with each iteration.

I hope you guys can help me with that.
Maybe I just missed an important point in the documentation.

The updated files:

FC_input.lst
*FC Test

*GND
C GND.txt 1.0 0.0 0.0 0.000000 + 0xd8d8d8ff
C GND_sides.txt 1.0 0.0 0.0 0.000000 + 0xd8d8d8ff
C GND.txt 4.0 0.0 0.0 0.000035 0xd8d8d8ff

*PCB
D PCB_TOP.txt 1.0 4.0 0.0 0.0 0.0 -0.0010 -0.0010 -0.0010 0xa793b4ff
D PCB_BOTTOM.txt 1.0 4.0 0.0 0.0 0.0 -0.0010 -0.0010 -0.0010 0xa793b4ff
D PCB_SIDES.txt 1.0 4.0 0.0 0.0 0.0 -0.0010 -0.0010 -0.0010 0xa793b4ff

*D PCB_TEST.txt 1.0 4.0 0.0 0.0 0.0 -0.0010 -0.0010 -0.0010 0xa793b4ff

*Mitte
C Mitte.txt 4.0 0.0 0.0 0.001635 + 0xd8d8d8ff
C Mitte_sides.txt 1.0 0.0 0.0 0.001635 + 0xd8d8d8ff
C Mitte.txt 1.0 0.0 0.0 0.001670 0xd8d8d8ff

*WireOut
C WireOut.txt 4.0 0.0 0.0 0.001635 + 0xd8d8d8ff
C WireOut_sides.txt 1.0 0.0 0.0 0.001635 + 0xd8d8d8ff
C WireOut.txt 1.0 0.0 0.0 0.001670 0xd8d8d8ff

GND.txt
0 GND

T GND 0.0018 0.0059 0.0 0.0164 0.0059 0.0 0.0018 0.0010 0.0
T GND 0.0018 0.0010 0.0 0.0164 0.0059 0.0 0.0164 0.0010 0.0

GND_sides.txt
0 GND_sides

Q GND 0.0018 0.0059 0.0000 0.0164 0.0059 0.0000 0.0164 0.0059 0.000035 0.0018 0.0059 0.000035
Q GND 0.0018 0.0059 0.0000 0.0018 0.0010 0.0000 0.0018 0.0010 0.000035 0.0018 0.0059 0.000035
Q GND 0.0018 0.0010 0.0000 0.0164 0.0010 0.0000 0.0164 0.0010 0.000035 0.0018 0.0010 0.000035
Q GND 0.0164 0.0010 0.0000 0.0164 0.0059 0.0000 0.0164 0.0059 0.000035 0.0164 0.0010 0.000035

PCB_TOP.txt
0 PCB

*TOP
T PCB 0.0008 0.0069 0.001635 0.0069 0.0069 0.001635 0.0008 0.0000 0.001635
T PCB 0.0008 0.0000 0.001635 0.0069 0.0000 0.001635 0.0069 0.0069 0.001635
T PCB 0.0069 0.0045 0.001635 0.0091 0.0023 0.001635 0.0069 0.0023 0.001635
T PCB 0.0069 0.0023 0.001635 0.0069 0.0000 0.001635 0.0109 0.0023 0.001635
T PCB 0.0069 0.0000 0.001635 0.0109 0.0000 0.001635 0.0109 0.0023 0.001635
T PCB 0.0109 0.0023 0.001635 0.0109 0.0000 0.001635 0.0174 0.0023 0.001635
T PCB 0.0109 0.0000 0.001635 0.0174 0.0000 0.001635 0.0174 0.0023 0.001635
T PCB 0.0109 0.0023 0.001635 0.0121 0.0023 0.001635 0.0121 0.0035 0.001635
T PCB 0.0121 0.0023 0.001635 0.0124 0.0023 0.001635 0.0124 0.0069 0.001635
T PCB 0.0121 0.0023 0.001635 0.0124 0.0069 0.001635 0.0121 0.0069 0.001635
T PCB 0.0069 0.0069 0.001635 0.0121 0.0069 0.001635 0.0069 0.0058 0.001635
T PCB 0.0069 0.0058 0.001635 0.0121 0.0058 0.001635 0.0121 0.0069 0.001635
T PCB 0.0124 0.0023 0.001635 0.0124 0.0045 0.001635 0.0174 0.0045 0.001635
T PCB 0.0124 0.0023 0.001635 0.0174 0.0023 0.001635 0.0174 0.0045 0.001635
T PCB 0.0133 0.0045 0.001635 0.0133 0.0053 0.001635 0.0174 0.0053 0.001635
T PCB 0.0133 0.0045 0.001635 0.0174 0.0045 0.001635 0.0174 0.0053 0.001635
T PCB 0.0159 0.0053 0.001635 0.0174 0.0053 0.001635 0.0174 0.0069 0.001635
T PCB 0.0159 0.0053 0.001635 0.0174 0.0069 0.001635 0.0159 0.0069 0.001635
T PCB 0.0124 0.0055 0.001635 0.0159 0.0055 0.001635 0.0159 0.0069 0.001635
T PCB 0.0124 0.0069 0.001635 0.0124 0.0055 0.001635 0.0159 0.0069 0.001635

PCB_BOTTOM.txt
0 PCB

*BOTTOM

T PCB 0.0008 0.0069 0.000035 0.0018 0.0069 0.000035 0.0008 0.0000 0.000035
T PCB 0.0008 0.0000 0.000035 0.0018 0.0000 0.000035 0.0018 0.0069 0.000035
T PCB 0.0018 0.0000 0.000035 0.0018 0.0010 0.000035 0.0164 0.0010 0.000035
T PCB 0.0018 0.0000 0.000035 0.0164 0.0000 0.000035 0.0164 0.0010 0.000035
T PCB 0.0164 0.0000 0.000035 0.0174 0.0000 0.000035 0.0174 0.0069 0.000035
T PCB 0.0164 0.0000 0.000035 0.0174 0.0069 0.000035 0.0164 0.0069 0.000035
T PCB 0.0164 0.0059 0.000035 0.0164 0.0069 0.000035 0.0018 0.0059 0.000035
T PCB 0.0018 0.0069 0.000035 0.0018 0.0059 0.000035 0.0164 0.0069 0.000035

PCB_SIDES.txt
0 PCB

*SIDES
Q PCB 0.0008 0.0069 0.000035 0.0174 0.0069 0.000035 0.0174 0.0069 0.001635 0.0008 0.0069 0.001635
Q PCB 0.0174 0.0069 0.000035 0.0174 0.0000 0.000035 0.0174 0.0000 0.001635 0.0174 0.0069 0.001635
Q PCB 0.0174 0.0000 0.000035 0.0008 0.0000 0.000035 0.0008 0.0000 0.001635 0.0174 0.0000 0.001635
Q PCB 0.0008 0.0000 0.000035 0.0008 0.0069 0.000035 0.0008 0.0069 0.001635 0.0008 0.0000 0.001635

Mitte.txt
0 Mitte

T Middle 0.0069 0.0045 0.0 0.0121 0.0058 0.0 0.0069 0.0058 0.0
T Middle 0.0069 0.0045 0.0 0.0121 0.0058 0.0 0.0121 0.0045 0.0
T Middle 0.0069 0.0045 0.0 0.0091 0.0045 0.0 0.0091 0.0023 0.0
T Middle 0.0091 0.0035 0.0 0.0121 0.0035 0.0 0.0091 0.0045 0.0
T Middle 0.0091 0.0045 0.0 0.0121 0.0045 0.0 0.0121 0.0035 0.0
T Middle 0.0091 0.0035 0.0 0.0109 0.0035 0.0 0.0091 0.0023 0.0
T Middle 0.0091 0.0023 0.0 0.0109 0.0035 0.0 0.0109 0.0023 0.0
T Middle 0.0109 0.0035 0.0 0.0121 0.0035 0.0 0.0109 0.0023 0.0

Mitte_sides.txt
0 Mitte_sides

Q Middle 0.0069 0.0058 0.0000 0.0121 0.0058 0.0000 0.0121 0.0058 0.000035 0.0069 0.0058 0.000035
Q Middle 0.0121 0.0058 0.0000 0.0121 0.0045 0.0000 0.0121 0.0045 0.000035 0.0121 0.0058 0.000035
Q Middle 0.0121 0.0045 0.0000 0.0121 0.0035 0.0000 0.0121 0.0035 0.000035 0.0121 0.0045 0.000035
Q Middle 0.0121 0.0035 0.0000 0.0109 0.0023 0.0000 0.0109 0.0023 0.000035 0.0121 0.0035 0.000035
Q Middle 0.0109 0.0023 0.0000 0.0091 0.0023 0.0000 0.0091 0.0023 0.000035 0.0109 0.0023 0.000035
Q Middle 0.0091 0.0023 0.0000 0.0069 0.0045 0.0000 0.0069 0.0045 0.000035 0.0091 0.0023 0.000035
Q Middle 0.0069 0.0045 0.0000 0.0069 0.0058 0.0000 0.0069 0.0058 0.000035 0.0069 0.0045 0.000035

WireOut.txt
0 WireOut

T WireOut 0.0124 0.0055 0.0 0.0133 0.0045 0.0 0.0124 0.0045 0.0
T WireOut 0.0124 0.0055 0.0 0.0133 0.0055 0.0 0.0133 0.0045 0.0
T WireOut 0.0133 0.0055 0.0 0.0159 0.0055 0.0 0.0133 0.0053 0.0
T WireOut 0.0159 0.0055 0.0 0.0159 0.0053 0.0 0.0133 0.0053 0.0

WireOut_sides.txt
0 WireOut_sides

Q WireOut 0.0124 0.0055 0.0000 0.0124 0.0045 0.0000 0.0124 0.0045 0.000035 0.0124 0.0055 0.000035
Q WireOut 0.0124 0.0045 0.0000 0.0133 0.0045 0.0000 0.0133 0.0045 0.000035 0.0124 0.0045 0.000035
Q WireOut 0.0133 0.0045 0.0000 0.0133 0.0053 0.0000 0.0133 0.0053 0.000035 0.0133 0.0045 0.000035
Q WireOut 0.0133 0.0053 0.0000 0.0159 0.0053 0.0000 0.0159 0.0053 0.000035 0.0133 0.0053 0.000035
Q WireOut 0.0159 0.0053 0.0000 0.0159 0.0055 0.0000 0.0159 0.0055 0.000035 0.0159 0.0053 0.000035
Q WireOut 0.0159 0.0055 0.0000 0.0133 0.0055 0.0000 0.0133 0.0055 0.000035 0.0159 0.0055 0.000035
Q WireOut 0.0133 0.0055 0.0000 0.0124 0.0055 0.0000 0.0124 0.0055 0.000035 0.0133 0.0055 0.000035

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