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measuring output transitions in ADE

lowpower

Hi,

I am running a simple transient simulation. During the simulation, I have three signals of interest: A is an input, B is an input, and C is an output.  If A transitions when B is low, C should go high. I need to measure the total number of successful (and unsuccessful) transitions of C while it is subjected to local variations (e.g. Monte-Carlo 1000point run).

I understand how to use "delay", etc. functions but this is really messy and I need lots of post-processing.

Is Ocean the only way to determine these sort of logical expressions?


Thanks,

  • Hi Matthew,

    it's not that hard to do.

    Do a "cross" function of your output (and maybe input too for comparison):
    ( I've done that in the CIW after the simulation)

    out=cross(i("/R0/PLUS" ?result "tran") 50u 1 "rising" t "time" )
    (This is a current output of a resistor, finding the crossing of 50uA)
    "out" will now hold the waveform with the crossing points

    Now you just need to count the number of points:

    numEdge=drVectorLength(drGetWaveformXVec(out))

    You probably could also use our "Eye Diagram Assistant" available in Viva and run all kind of statistics there. I'm not that familiar
    with it to explain it, but the documentation should be able to help.


    Regards,
    Marc
  • Nice ... I forgot about numEdge :) Yes it is a clean solution with cross. I will also check out the "eye diagram assistant". Thanks much!

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