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ra3xdh / qucs_s

Qucs-S is a circuit simulation program with Qt-based GUI
https://ra3xdh.github.io/
GNU General Public License v2.0
867 stars 111 forks source link

Misleading axis description #1023

Closed dwarning closed 1 day ago

dwarning commented 2 days ago

export

The y axis descriptions are misleading. If I make a S-Parameter simulation with noise calculation ON everything in the plotted diagrams get v(), e.g. v(s_2_1). Same for noise figure values and other results. The wisdom is, NF and NFmin comes from ngspice as dB and noise equivalent resistor has Ohm. I recommend removing the v() for any s-param result.

ra3xdh commented 2 days ago

The Qucs-S takes the variable names from RAW dataset as is and has no smart variable recognition. If Ngspice puts the NF parameter as V(NF) it will be plotted as voltage. As far as I know all outputs of S-parameter simulation are represented as virtual voltages.

dwarning commented 1 day ago

@ra3xdh You are right it is not a bug, perhaps we have to solve it in ngspice.