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getting the number of points in a waveform, or the number of events...

MarkGr15

I want to count the number of times an analog waveform crosses a threshold. It will do so , lets say 3 times, in a period in time (I am going to clip the time period in the Spectre calculator).

This is what I am trying, it creates a waveform (N time points, with associated values).

overCurrentXingsInClip1=cross(clip(VT("/fb_top1/I_buck_nonlinear/I0/overcurrent_det")  20u 40u ) 1.8/2 1 "rising"  t "time"  )

I want the number of time points.  Is there a way to get this?

The goal is to count the number of crossings, mind you. If there is another way to skin the cat, I'm open to that.

Thanks

Mark

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  • ShawnLogan

    Hi Mark,

    > I want the number of time points.  Is there a way to get this?

    I have used the cross() function but with the "cycle" argument in lieu of "time". I then determine the length of the vector. I've attached a sample of the code below.

    zcross_hsclki = cross(hsclki_clipped 0 0 "rising" t "cycle")

    xvector = drGetWaveformXVec(zcross_hsclki)

    xvector_length = drVectorLength(xvector)

    printf("Vector phase length = %d.\n" xvector_length)

    This might do what you want - assuming I understand your intent Mark!

    Shawn

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  • ShawnLogan

    Hi Mark,

    > I want the number of time points.  Is there a way to get this?

    I have used the cross() function but with the "cycle" argument in lieu of "time". I then determine the length of the vector. I've attached a sample of the code below.

    zcross_hsclki = cross(hsclki_clipped 0 0 "rising" t "cycle")

    xvector = drGetWaveformXVec(zcross_hsclki)

    xvector_length = drVectorLength(xvector)

    printf("Vector phase length = %d.\n" xvector_length)

    This might do what you want - assuming I understand your intent Mark!

    Shawn

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