Deembedding chip data

[prameela b]

Hi,

I have a Raw_data. s2p file with the network containg Lg,Lsh and chip as shown below. I need to deembed the chip data from this Raw_data network.

It would be grateful if you check whether the below code is correct?

cnx = [
    [(port1, 0), (Lg.inv, 0)],
    [(Lg.inv, 1), (Lsh.inv, 0), (raw_data, 0)],
    [(raw_data, 1), (port2, 0)],
    [(Lsh.inv, 1), (ground, 0)],
]        
cir_deemb = rf.Circuit(cnx)
chip = cir.network

The Lg.inv is working fine. But the effect of Lsh.inv is not seen.

Thanks

[Julien Hillairet]

If you already know the "Lg" and "Lsh" Network, then it is easy: getting the chip Network consists of "removing" (deembedding) the combination of Lg and Lsh using the "inverse" of this combination:

chip = (Lg ** Lsh).inv ** raw_data_ex

Here is an example to check it works:

import skrf as rf

#%% Generate a dummy example of "Raw_data"

chip_ref = rf.data.ring_slot  # dummy reference example

# create some Lg and Lsh Networks

media = rf.DefinedGammaZ0(frequency=chip_ref.frequency)

Lg = media.inductor(10e-9)
Lsh = media.shunt_inductor(20e-9)

# create a dummy example of your Raw_data

raw_data_ex = Lg ** Lsh ** chip_ref

#%% Deembedding the elements in front of the chip
chip = (Lg ** Lsh).inv ** raw_data_ex

print(chip == chip_ref)  # True

Julien

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[Vincent Wang]

Hi Sir,

I have a raw data “.s4p(normal mode)”, which is for the differential signals.

1.     Can I use “skrf” and then convert the file to “.s4p (mix mode)”?

2.     Can you give an example?

 

Thanks~

Vincent

julien.h...@gmail.com 在 2023年5月19日 星期五下午5:15:54 [UTC+8] 的信中寫道：

[Denz Choe]

Hi All, 

There is a wealth of information here.

https://scikit-rf.readthedocs.io/en/latest/tutorials/Deembedding.html#What-is-de-embedding-and-how-does-it-differ-from-calibration?

https://scikit-rf.readthedocs.io/en/latest/examples/mixedmodeanalysis/Mixed%20Mode%20Basics.html

https://scikit-rf.readthedocs.io/en/latest/examples/networktheory/IEEEP370%20Deembedding.html#Mixed-mode

Remember to explore, and if all else fails, 'Search' in the search box ;)

To view this discussion on the web visit https://groups.google.com/d/msgid/scikit-rf/75aa608c-a1d4-4efa-84a0-95e835859a49n%40googlegroups.com.

--

Regards,
Choe

[Denz Choe]

oops, sorry should include this link as well..


https://scikit-rf.readthedocs.io/en/latest/tutorials/Introduction.html#Cascading-and-De-embedding

[prameela b]

Thank you for the response. This code works when using "Lsh = media.shunt_inductor(20e-9)". But if I am using s2p files of inductors Lg and Lsh, and use "chip = (Lg ** Lsh).inv ** raw_data_ex" the ground connection of Lsh will not work. So I have a few doubts:

1. When using s2p files how to deembed the Lg connected in series and Lsh connected to ground from rawdata using ** operator.

2. Is there a way to include the s2p file into .shunt_inductor()

Regards

Dr. Prameela B

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[Julien Hillairet]

If your shunt inductor is a two-port Network "ntwk", try the following:

Lsh = media.shunt(ntwk ** media.short())

Julien

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[王文頡]

Hi Sir,

Can I simply get the file "mixed mode.s4p" as shown below?

(but it seems fail) 

============python code==================================== 

import skrf as rf
normal_mode_file = 'normal_mode.s4p'
normal_mode_network = rf.Network(normal_mode_file)
mixed_mode_network = normal_mode_network.to_mixed_mode()
mixed_mode_file = 'mixed_mode.s4p'
mixed_mode_network.write_touchstone(mixed_mode_file)

===============================================================

============error message==================================== 

runfile('C:/Python_test/01_Normal_Mix_convert/01_Normal_to_Mix_2023.py', wdir='C:/Python_test/01_Normal_Mix_convert')
Traceback (most recent call last):

  File "C:\Python_test\01_Normal_Mix_convert\01_Normal_to_Mix_2023.py", line 16, in <module>
    mixed_mode_network = normal_mode_network.to_mixed_mode()

  File "C:\Users\vincent.wang\Anaconda3\lib\site-packages\skrf\network.py", line 944, in __getattr__
    raise AttributeError

AttributeError

Denz Choe <kinkha...@gmail.com> 於 2023年5月23日 週二 上午9:03寫道：

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[Julien Hillairet]

Dear Vincent,

I'm not sure about this specific file, but you can find example files in the documentation directory (doc/source/...) in the scikit-rf installation directory. Otherwise, directly on Github : https://github.com/scikit-rf/scikit-rf/tree/master/doc/source

Julien

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[Vincent Wang]

Hi Sir,

I have a question about how to package an.exe file.

Actually, I use “scikit-rf ”, and using pyinstaller to package one file as below shown error massage.

cmd: pyinstaller --onefile 00_HSReport_xxx_FD_RV_alleq_20310917_2_one_ok.py

Do you have any suggestions for how I should go about doing this? or which tool I can package source with sciket-rf?

Thanks~

=============================================================================================

C:\Python_test\09_Project\01_xxx\00_Report>00_HSReport_xxxx_FD_RV_alleq_20310917_2_one_ok.exe

Traceback (most recent call last):

  File "00_HSReport_BB49_FD_RV_alleq_20310917_2_one_ok.py", line 9, in <module>
    import skrf as rf
  File "<frozen importlib._bootstrap>", line 991, in _find_and_load
  File "<frozen importlib._bootstrap>", line 975, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 671, in _load_unlocked
  File "PyInstaller\loader\pyimod02_importers.py", line 385, in exec_module
  File "skrf\__init__.py", line 14, in <module>
  File "<frozen importlib._bootstrap>", line 991, in _find_and_load
  File "<frozen importlib._bootstrap>", line 975, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 671, in _load_unlocked
  File "PyInstaller\loader\pyimod02_importers.py", line 385, in exec_module
  File "skrf\media\__init__.py", line 40, in <module>
  File "<frozen importlib._bootstrap>", line 991, in _find_and_load
  File "<frozen importlib._bootstrap>", line 975, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 671, in _load_unlocked
  File "PyInstaller\loader\pyimod02_importers.py", line 385, in exec_module
  File "skrf\media\freespace.py", line 20, in <module>
  File "<frozen importlib._bootstrap>", line 991, in _find_and_load
  File "<frozen importlib._bootstrap>", line 975, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 671, in _load_unlocked
  File "PyInstaller\loader\pyimod02_importers.py", line 385, in exec_module
  File "skrf\data\__init__.py", line 35, in <module>
  File "skrf\network.py", line 447, in __init__
  File "skrf\util.py", line 268, in get_fid
FileNotFoundError: [Errno 2] No such file or directory: 'C:\\Users\\VINCEN~1.WAN\\AppData\\Local\\Temp\\_MEI157082\\skrf\\data\\ntwk1.s2p'
[10732] Failed to execute script '00_HSReport_BB49_FD_RV_alleq_20310917_2_one_ok' due to unhandled exception!

julien.h...@gmail.com 在 2023年5月25日 星期四下午3:01:12 [UTC+8] 的信中寫道：

[Franz Forstmayr]

This is probably because skrf tries to load some local files after importing, which are probably not packed by pyinstaller.

You could try this branch https://github.com/scikit-rf/scikit-rf/pull/957 which tries to remove the loading of the files if not needed initially.

BR Franz