S-parameter analysis has been supported in Qspice since the January 26 update. The .net feature has been implemented and also supports dragging and dropping a .s2p file into the schematic to generate an S-parameter subcircuit model, a process that requires a third-party tool in LTspice. These are critical updates related to the .net implementation.
- 01/14/2026 Implemented a .net command to extract small signal network scattering parameters.
- 01/15/2026 Implemented Smith charts.
- 01/20/2026 A resistor’s AC value can now be complex.
- 01/25/2026 Implemented export of S-parameters in Touchstone file format.
- 01/27/2026 There’s now support for drag and drop of a 2-port Touchstone(.s2p) file onto a schematic for frequency-domain simulation.
This post provides more details to summarize the .net simulation for S-parameters.
.net Network Parameters simulation with Touchstone .s2p file - QSPICE - Qorvo Tech Forum