Simulation Step Tool

QSPICE
1

Hello,

I’m encountering an issue with the waveform plotter when analyzing ‘.step’ simulation results. The “Select Steps” command doesn’t seem to be working as expected.

Steps to Reproduce:

  1. Create any circuit that uses a ‘.step param’ directive to run multiple simulations (e.g., ‘.step param MYPARAM 1 4 1’).
  2. Run the simulation.
  3. Plot a voltage or current. All traces from all steps appear on the plot, as expected.
  4. Right-click on the plot window and choose Select Steps.
  5. From the dialog that appears, select a single step run (e.g., the run where ‘MYPARAM=3’) and click Apply.

Expected Behavior: The plot should update to display only the waveform trace from the single selected step (‘MYPARAM=3’).

Actual Behavior: The plot does not change. All waveforms from all steps remain visible, plotted on top of each other, making it difficult to analyze a single run.

I suspect this might be a plotter refresh issue, possibly triggered by the complexity of the model or the large number of data points being processed from the stepped simulation.

Due to confidentiality, I cannot share the model, but I have attached a screenshot that illustrates the problem.

Is this a known issue, or is there a setting I might be missing?

Thank you.

image
image425×346 32.5 KB

2

Without an example, it’s hard to tell what you are experiencing. A quick test suggests everything still works out as expected. This screen capture is an example to plot only step 2 and 4 with sync for all plot panes.

.step-plot.qsch (1.7 KB)

image
image1835×945 97.3 KB

3

Thank you Mr Kelvin for your response. I guess since I was not selecting the Sync All Plot Panes option, I was not able to plot individual step plots. But when I selected the sync all plot panes box, it worked perfectly fine.
Thank you again.

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