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generate histogram from multiple run automatically

olalivier

Hi there, 

I need to run multiple times, with different setups the same simulation and plot the histogram of a measurement from these simulations. It's almost like a "monte-carlo' like simulation but it's a tran-noise simulation. The simulation is the one described in this post : https://community.cadence.com/cadence_technology_forums/f/mixed-signal-design/46773/can-t-evaluate-value-of-a-tran-signal-at-derived-value

I run the same simulation multiple times using a "dummy" variable. By dummy I mean the variable does not affect a circuit parameter. At the end of this multiple runs I'd like to automatically plot the histogram of the value I measure, in this case : 

time_read_t = cross(VT("/read") 1.65 1 "falling" nil nil nil)

value_read = value(VT("/vout") time_read_t)

Is there a way to plot this histogram ?

Thank you very much for your help.

Olivier 

  • Hi Olivier,

    In my case where I replicated (to some extent) your setup, my value_read is called sinVal (but the expression matches yours). I'm sweeping a variable (dummySeed) which I then use as the value of the seed on the transient noise options form (using VAR("dummySeed"). I then swept that from 1 to 100 (1:1:100) and I get a plot of the value read at the read time versus the sweep.

    If you then select that trace, and then in the ViVA graph do Measurements->Histogram. Pick the number of bins you want (I picked 10) and any other special options you like and set the Plot Mode to (say) New Subwindow. Hit Plot. You'll then get the histogram.

    In order to get this every time, I then selected the histogram (in the legend, say) and did Right Mouse->Send To->ADE. This adds a new expression into your ADE outputs. In Assembler, change the "Eval Type" column for that output to be "sweeps" (rather than "point") so that the histogram is computed across the sweep (note, in ADE Explorer the Eval Type column isn't shown by default - you have to go to the column headings in the Outputs pane and do Right Mouse and enable the Eval Type column). Here's my setup (ADE will change the colour of the output to indicate that it's not a "point" expression):

    Here's what I get from the plot after simulation:

    Hope that helps!

    Regards,

    Andrew.

  • in reply to Andrew Beckett

    Hi Andrew, thank you very much for your help. This is something I did not know. Actually I've never even  noticed you could change this parameter from point to sweep. This is a very useful thing I'll use a lot, for sure.

    Have a good day.

    Olivier 

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