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Calculator skill function for sampling signal on varying pulse edge

daly

Hi there,

I have been trying unsuccessfully to use the built-in Cadence calculator functions to sample an analog signal at multiple times, based on a digital clock edge which comes at non-periodic times.  Has anyone had success using the functions such as "value", "sample" or "cross" to do this?  "cross" can get me the array of times I would like to sample, but I can't find a function that gives me the value of another analog waveform based on this array of times.

If there is no way to do it using the built-in calculator, I would like to write a custom SKILL calculator function to implement this functionality.  Does anyone have a similar example program that I could use as the starting point?

Thanks! 

  • Hi there,

     

    Let'a assume that in list l_times you have the time values for which you want to have the associated values.

    Do a foreach (or better mapcar) and using value() or sample() build a new list with the values , l_values.

    Now you will need to create two vectors and then the waveform:

    xV = drCreateVec('double l_times)

    yV = drCreateVec('double l_values)

    thewave = drCreateWaveform(xV yV)

    My assumption was that on x/y axis you have type 'double .

     For dr* functions used above you may have a look on skartistref.pdf  (Virtuoso Analog Design Environment SKILL Language Reference) documentation.

    Best Regards,

    Marcel

     

  • Marcel - thanks so much.  Your tips led me in the right direction and I was able to get the code working!

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