QSpice Stalls when using Derivative Function with Behavioral Resistors

[byirb]

I encounter issues using the derivative (DDT) function with behavioral resistors. It seems to work totally fine with behavioral sources.

The following works fine :

The error occurs when using the derivative function DDT with the behavioral resistor as below. This causes QSpice to stall when the ‘Run’ button is pressed.

Rather than creating a plot or showing Total Elapsed Time in the Output window, it does not generate the plot and the output is blank :

Also, QSpice does generate the Rawfile…

…but when I try to open it I see this :

The weird thing is that although I mostly encounter the error above sometimes it works. Sometimes if I just wait several minutes and hit the run button again, the plot generates no issue and displays what it should.

[byirb]

I just closed the file and opened it again after reading some other posts for a few minutes. Didn’t change anything, same schematic :

But this time, seemingly for no reason, the plot generated and I got a ‘Total elapsed time’ message in the Output :

Even the value of the output current displayed in the graph makes sense. 1 Volt / 8 Ohms = 125 mA.

Then I try hitting the ‘Run’ button again… and it stalls. Same error as in original post. Inconsistent behavior.

[Cornel]

I am running with this version of qspice without seeing problem:

[byirb]

Interesting. Just tried again, version is even higher for me, but still encountering the problem…

[byirb]

QSpice64 works with the ASCII File, but the GUI QUX does not work using the ‘Run’ button.

I used the “View → Netlist” feature to look at the ASCII Netlist that the schematic was generating, then I saved that ASCII Netlist as a separate file.

I ran QSPICE64 on the ASCII Netlist file (SpiceStack2, in the screenshot below) and told it where to output the Rawfile.

And it worked? IDK why, but it seems like I encounter the problem when specifically using the ‘Run’ button in QSpice. When given the ASCII Netlist, QSPICE64 works no problem.

[byirb]

Windows Error Generated When Using Run in QUX

I opened up the Event Viewer in Windows, and discovered that there is an error generated when I try using ‘Run’;

[Cornel]

Running with latest version of qspice for your problem, I received no errors: