Calculator value() returns multiple values for given set of multiple x values as returned by cross()

Not really. However, one thing you could do is to use the cross function with 0 as the crossing number - in this case it returns a SKILL list of the crossing points. You could then use foreach on the resulting list and then call value() for each crossing point.

It wouldn't be too hard to write such a function - that said, I think it would be a generally useful function to be able to sample a signal at the crossing point of some triggering signal. Probably worth contacting customer support to suggest this as an enhancement. If I have a moment, I'll see if I have time to write a function to do this.

Regards,

Andrew.

Thank you for your reply Andrew. I will file the enhancement request with customer support as suggested.

Also,  what do you mean by "crossing number" ? Do you mean "edge number" in the cross function ? If yes, then i believe it returns an array of x-axis times irrespective of the edge number value, as long as the number of occurrences = multiple. Or am i missing something ?

Finally, Is there a difference between a SKILL list and these array of values i see coming back in the calculator ? 

Thanks & BR,

I was replying from memory - what I called "crossing number" is referred to on the cross form as "Edge number". If the edge number is 0 (forget about the fifth argument onwards which allow you to return single or multiple values), then it returns a SKILL list (not a waveform) with all the crossing points. If you pass t as the fifth argument, it returns a waveform where all the points correspond to the crossing points, where the x values can either be the time of the crossing or the number ("cycle") of the crossing. A waveform object is a distinct object that can be plotted directly, whereas a list is a simple list of values that can easily be processed in SKILL. Bit complicated to describe in a few words - sorry...

A list would just be something like (0.1e-9 2.3e-9 5.7e-9) for example.

Regards,

Andrew.

Good morning Andrew. 

FYI, I submitted the enhancement request as you recommended.

I tried your suggestion of setting 0 on the Edge number, but if i do that, the expression fails in the calculator. Im guessing both the calculator / test editor outputs can't handle the skill list object that is returned.

So can you walk me through how to generally implement your suggestion of using "a foreach loop on the resulting list and then call value() for each crossing point" please.

Note i have never used ocean before, and have tried since yesterday to read through the reference documentation and watch youtube videos to get started.

Finally,  in the ADE L test editor and the Setting Outputs window, there is an option to use ocean as the "Measurement Type". I cant find any information on this. Any ideas ?

Thanks

Faisal

For completeness (I'm working on Faisal's request via customer support too), I realised that I'd written a bit of code for a colleague that does exactly what is needed here a while back, and that he'd written it up as an article on Cadence Online Support. Here's a link to that article (I just updated it to add the function UI builder capability that's there in IC617 and beyond).

Regards,

Andrew.

Hi Andrew,

I am doing a slow ramp up/down around a reference voltage for a comparator and measuring the trip points. After that, I change to another reference voltage and repeat the process.

I used abCrossTwoWaves.il to get voltage points on rising and falling edges of the comparator output crossing a threshold. But, I would like to average the rising and falling edge voltage values. because the vector created for rising/falling is at different time instants, I am not able to add them. i.e let's say rising edge is 53m and falling edge is at 200ms so, voltage points will be at those time instants using the above SKILL function. how can I convert this to just two arrays with voltage points which can be added? or if there is another way...