S parameter simulation

[KSKelvin]

If you work on S parameter simulation, @frank.wiedmann mentioned a MicroSim App Note, and this circuit further simplify the simulation setup. I also performed a study on that app note and summarize into a study note upload to Github.

How to extract S-parameters (S11, S21, S21, and S22) from passive network?

Based on @frank.wiedmann reference link, convert test circuit as this MicroSim App Note and yield the same results. I didn’t think about adding another 1V source can get S11 directly from port1 voltage. But above post can still help you to plot S11 into a SmithChart, and leave a reference about how to use a single source to get S11 and S21. [image]

I made symbols for S-parameters simulation from above idea and in this Github link
https://github.com/KSKelvin-Github/Qspice/tree/main/Symbols-KSKelvin/.ac

Here is an example setup to use these symbols.
example.S-param.qsch (4.5 KB)