To compare models, I did a calculation of the volt-ampere characteristic of a MOS transistor. The calculation did not take place. I added .opt GMINSTEPS=0. After that the calculation started. The transistor model is from International Rectifier.
The second problem is that the graphical results window disappears.
I have WIN 11.
I have to use Reopen Waveform Viewer.
And this is not only for this circuit.
irfp150n.qsch (3.5 KB)
If you are comfortable using Python, I think this helps:
You don’t understand. I want to use Qspice without problems. The scheme is simple, but already a problem! The problem is in the program solver. In addition, recently there was a problem with the output window with diagrams. And this happened with other projects. I didn’t like opening this window again!
1 Like
This simulation with a single .DC directive gets very elegant indeed!
This simulation will run better if you add NoOpiter in .option.
I don’t know the reason, but Qspice can only run the dc solution with adaptive source stepping for this subckt. Both Direct Newton Iteration and Adaptive Gmin Stepping seems not able to get a result from this subckt. NoOpiter is to disable Direct Newton Iteration and GminSteps=0 is to disable Adaptive Gmin Stepping, and forced Qspice to run directly into adaptive source stepping for DC solution.
** remark : sorry, I found that Gmin Stepping also work in this simulation, but it is very ineffective!! The total simulation time is about 27s in my laptop, as compare to Source stepping only requires 0.1s.
1 Like