touchstone file not working.

[oe2lsp]

I either get an error massage or qucs-s terminates without any error message.

Qucs-s Version 2.1.0
Ngspice Version 41

two files attached:
terminate.zip
error.zip

Both touchstone files are working fine in qucs, the schematic files were created directly on qucs-s.
If there is any additional information needed, please let me know

TODO

• Fix comments processing in touchstone files
• Fix line continuation processing in touchstone files
• Add support for MA format
• Fix crash if tabs are used as delimiter Segmentation fault when simulating s2p file with tabs #475

Originally posted by @oe2lsp in #233 (comment)

[ra3xdh]

qucs-s terminates without any error message

Yes, it's a bug. Thanks for reporting. I have just added a fix. The fix will be available since the next version. As a workaround you may remove the comment lines (starting with !) from the *.s2p files.

I either get an error message

The fix for s3p files will require some time. This files contains line continuation and the S-parameters list for every point is splitted to several lines. The original s2spice utility cannot process such files. On the other hand Ngspice doesn't support the S-parameters simulation if the port number is not equal two. You may convert this file if you combine the lines, but the 3-port S-parameter simulation will not work. You have to use Qucsator for such schematic.

[oe2lsp]

thanks so far

[tomhajjar]

I found another issue. I edited the BFP780 s2p file to remove the comments but the test data is wrong. s11... s22 is always 0.5.

All my prior testing was done using Spice files converted from S-parameter files via s-spice.exe. I really didn't test any S-parameter files directly with the new Qucs-S version.

Updated Zip to include testing using S-parameter file converted by s-spice for comparison.

BFP780_test_prj.zip

[ra3xdh]

I edited the BFP780 s2p file to remove the comments but the test data is wrong

This file uses Mag/Angle format instead of Re/Im. This is not supported by Qucs-S converter and will not work. I am not aware if such files are supported by any version of s2spice utility. Qucsator supports both MA and RI formats.

[tomhajjar]

The vast majority of manufacturer supplied S-parameter files use Mag/Angle. I would think s2spice support most formats.

[ra3xdh]

I will add the support for MA format in future versions. Please wait. I have updated TODO list.

[zergud]

please try current branch

[ra3xdh]

@zergud , Yes, now it is fixed.

[ra3xdh]

Need to check everything according touchstone syntax guide: https://ibis.org/touchstone_ver2.0/touchstone_ver2_0.pdf

[tomhajjar]

Can I get a Windows 64 version to continue testing? I have lot's of Qucs S-parameters test projects for comparison and s2spice.exe.

[ra3xdh]

I will try to prepare a demo package in this week.

[ra3xdh]

The line continuation processing fixed by #522