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extracting s2p file

robert 21 over 5 years ago

Hello, i managed to extract my S-param data into vcsv file,however i need a standart S2P file

i have this table displayed, as shown bellow.
is there a way to extract s2p file in cadence virtuoso?
Thanks.

Tawna over 5 years ago

Hi Robert21,

What is your end goal? Why are you putting your S-param data into a vcvs file?

Are you trying to get s-parameter data from a Spectre simulation? If so, run an sp analysis. Before launching the simulation, open the s-parameter options form. In the Output section, enter the filename for the sp file to be generated. e.g. myfilter.s2p. You can specify touchstone, touchstone2, etc. format. When running the sp simulation, be sure to start low in frequency (e.g. 1 Hz) and go high enough in frequency (I recommend 3X higher than the highest harmonic of interest). See the article on support.cadence.com "7 Habits of Highly Successful S-Parameters"

best regards,

Tawna
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Andrew Beckett over 5 years ago in reply to Tawna

The same question also came up less than two weeks ago in this post.
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robert 21 over 5 years ago in reply to Andrew Beckett
Hello Andrew, I have created a touchstone file by option as shown bellow.(i have renamed it in txt so i could upload it here) but Matlab is not recocnising it. How can i make a touchstone S2p file so Matlab will recognise it?

Thanks.

S = sparameters('touchstone_file');
disp(S)
.code-editor .code-editor-heading{border-top:1px

touchstone_f Download

! Touchstone Ver. 1.0 ! Number of ports is 2 # Hz S RI R 33.755800 50.000000 ! SCATTERING PARAMETERS : 5.00000000e+09 0.9998370462737904 0.01561915647365997 5.20000000e+09 0.9998497256974158 0.01455847058550708 5.40000000e+09 0.9998603067266405 0.01355985421811079 5.60000000e+09 0.9998690612280682 0.01261650200788977 5.80000000e+09 0.9998762140838179 0.01172257408596655 6.00000000e+09 0.9998819526463931 0.01087302974962978 6.20000000e+09 0.9998864340379372 0.0100634945449708 6.40000000e+09 0.9998897908395908 0.009290153150346869 6.60000000e+09 0.9998921355655948 0.008549662376414413 6.80000000e+09 0.9998935642108666 0.007839079991248998 7.00000000e+09 0.9998941590856577 0.007155806098073425 7.20000000e+09 0.9998939910968913 0.006497534546979655 7.40000000e+09 0.9998931215965843 0.005862212425338797 7.60000000e+09 0.9998916038889967 0.005248006096688408 7.80000000e+09 0.9998894844668497 0.004653272581385703 8.00000000e+09 0.9998868040309954 0.004076535320714725 8.20000000e+09 0.9998835983359299 0.003516463558252192 8.40000000e+09 0.9998798988944197 0.002971854722063183 8.60000000e+09 0.9998757335674879 0.002441619308815258 8.80000000e+09 0.9998711270606393 0.001924767863728749 9.00000000e+09 0.9998661013430123 0.001420399724134436 9.20000000e+09 0.999860676002864 0.0009276932533491822 9.40000000e+09 0.9998548685502222 0.0004458973390972787 9.60000000e+09 0.999848694675515 -2.567603098047044e-05 9.80000000e+09 0.9998421684713528 -0.0004876582729957946 1.00000000e+10 0.9998353026233591 -0.0009406299204920421 1.02000000e+10 0.9998281085748906 -0.001385125658118214 1.04000000e+10 0.9998205966696586 -0.001821638768065292 1.06000000e+10 0.9998127762755913 -0.002250625067812595 1.08000000e+10 0.9998046558926946 -0.002672506405974717 1.10000000e+10 0.9997962432472469 -0.003087673773112698 1.12000000e+10 0.9997875453742628 -0.003496490076215553 1.14000000e+10 0.9997785686898795 -0.00389929261856714 1.16000000e+10 0.9997693190550436 -0.004296395320964486 1.18000000e+10 0.9997598018316768 -0.004688090715227245 1.20000000e+10 0.9997500219323198 -0.005074651736867386 1.22000000e+10 0.9997399838641088 -0.005456333340124075 1.24000000e+10 0.9997296917678098 -0.005833373955639876 1.26000000e+10 0.9997191494525361 -0.006205996808381521 1.28000000e+10 0.9997083604266954 -0.006574411111208599 1.30000000e+10 0.9996973279256045 -0.006938813147607137 1.32000000e+10 0.9996860549362165 -0.007299387255423229 1.34000000e+10 0.9996745442192532 -0.007656306721985363 1.36000000e+10 0.9996627983290844 -0.008009734599855435 1.38000000e+10 0.9996508196316025 -0.008359824451240727 1.40000000e+10 0.9996386103203116 -0.008706721028325259 1.42000000e+10 0.9996261724308457 -0.009050560895804249 1.44000000e+10 0.9996135078540807 -0.009391473001326256 1.46000000e+10 0.9996006183479964 -0.009729579198835436 1.48000000e+10 0.9995875055484228 -0.01006499472930566 1.50000000e+10 0.9995741709787899 -0.01039782866286165

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Invalid option line for the Touchstone format:
# Hz S RI R 33.755800 50.000000
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Andrew Beckett over 5 years ago in reply to robert 21

I can't test this because I don't currently have a MATLAB RF Toolbox license, so can't use the sparameters function. However, the file being produced is a standard Touchstone format, so you should ask The Mathworks about this. Maybe it will accept it if you pick one of the other datatype values (e.g. magphase). Either way, it looks like a bug with the reader in MATLAB. Perhaps it can't cope with the fact that there are different impedances for each port?

Andrew
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Frank Wiedmann over 5 years ago in reply to robert 21

The problem is that you have two numbers after the R in the option line, probably because your ports have different impedances. This is not allowed by the specification, see http://www.ibis.org/touchstone_ver2.0/touchstone_ver2_0.pdf
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Andrew Beckett over 5 years ago in reply to Frank Wiedmann

Frank,

I think the issue was that only Touchstone 2.0 officially supports multiple reference impedances (that is described in the document you reference). However, given that Touchstone 1.0 is much more commonly used, this is a fairly common extension to the original format (despite not being covered in the spec; the trouble with ASCII formats is that they are rather easy to extend!). Spectre can also write Touchstone 2.0 (on newer versions of the form it offers the datafmt choice of touchstone2). However, the MATLAB documentation specifically says that the sparameters function doesn't support Touchstone 2.0 so that won't help either, unfortunately!

Andrew.
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robert 21 over 5 years ago in reply to Andrew Beckett

Hello Andrew, Yes when i switched to 50 ohm ports only it worked great.
So we cant use different impedance ports touchstone in matlab.
Thanks.
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