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SpectreMDL sensitivity analysis

mihaiciortuz

Hi all,

I am running a simulation that uses spectreMDL in order to detect the offset/ trigger point of a StrongARM latch. I then apply Monte Carlo from spectreMDL since I cannot use Monte Carlo inside the ADE.

However, by using this method, I'm not able to use the sensitivity analysis without ADE to determine the contribution of the device to that input referred offset. 

I am using Virtuoso IC6.1.8 ISR16.

Any help would be of great value.

Best regards,

Mihai

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  • Hi Mihai,

    I'm guessing that by "sensitivity analysis" you're referring to the ADE XL/Assembler sensitivity analysis (which is a large-signal sensitivity analysis of any measurement to some varied input) as opposed to the small-signal "sens" analysis built into spectre.

    The challenge here is that you're using two somewhat orthogonal simulation control mechanisms - one being ADE, and one being MDL. There is very limited support for mixing these, and beyond simple measurements alongside standard simulations, they don't play well together because they are both trying to control what is simulated.

    Why are you using SpectreMDL in this case - what particular feature do you need that can't be achieved with normal ADE/ViVA measurements?

    Regards,

    Andrew

  • in reply to Andrew Beckett

    Hi Andrew,

    Thank you very much for your reply. The reason I'm using SpectreMDL, in this case, is because I want to perform sensitivity analysis for each Monte Carlo run (binary search), something that's not possible from inside the ADE.  

    Many thanks,

    Mihai

  • in reply to mihaiciortuz

    Hi Mihai,

    OK, I wouldn't have called that "sensitivity analysis" - it's a binary search for a variable that meets some goal (assuming I've understood what you mean). You could do that with a pre-run script in ADE that works with Monte Carlo. If it's that you mean, there is a description of doing this in Techniques for Simulating Calibrated Circuits with Virtuoso ADE Assembler. I don't quite see how this is anything to do with contribution analysis though?

    I may just be missing something in my understanding of what you're attempting to do.

    Andrew

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