![]() # Hand-edit z.s2p and change the reference impedanceĬonvert-parameters -f S z.s2p converted. It's equivalent to converting to Z parameters with the first reference, then converting back with the second.Įdit (and self plug): if you have Linux or other POSIX environment such as cygwin, one of the examples that comes with libvna will do most of the work for you:Ĭonvert-parameters -f Z orig.s2p z.s2p # convert to Z Any hope that this limitation can be overcome 21. this is confirmed with the examples provided by QUCS. Viewing 2 posts - 1 through 2 (of 2 total). This topic has 1 reply, 2 voices, and was last updated 2 years, 3 months ago by QucsStudio. ![]() s2p file, because the table values will be be wrong for the new reference.įor the case of real, positive reference impedances, you can convert S parameters in Z1 to S parameters in Z2, using the following conversion. Further, it won't help to change the reference impedance in the. This conversion can't be done with a simple linear scaling operation. ![]() The Z parameters for this network, regardless of the reference impedance, are. Qucs-S emulation of the Qucs PlotVs() function Qucs-S output data processing with the Octave numerical analysis and visualization package Introduction Using Octave for numerical analysis and visualization of Qucs-S simulation output data The structure and content of Octave xxxxxx.m script files A second Octave xxxxxx. But if you have S parameters, it's not so simple.įor example, suppose your DUT is a simple T network 10dB attenuator for 50 ohms with R1=26.0 ohms on each arm, and R2=35.1 ohms to ground in the middle. Not specific to Qucs, just a general comment on renormalization - If you have Z, Y, G or H parameters, all you have to do is change the reference impedance at the top of the file and you're done.
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