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how to enforce identical MC mismatch variation on sub circuit used for calibration as those applied on the main test bench

HansB

 

good afternoon,

For a  high dynamic range CT SD ADC we need a few  calibrations prior to running MC process & mismatch verification. We were wondering about possibility to run these (analog) calibrations inside test suite using another test bench containing only the relevant sub circuits taken from  the main test bench, to save on compute resources as a single transient verification on ADC full schematic takes really a long time.  We then, for each MC iteration, need to enforce the same mismatch variations on the sub circuits used in the calibration testbench as will be applied on same sub circuits in main test bench.  Can this be accomplished with Maestro ?

kind regards

Hans

 

  • Andrew Beckett

    Hans,

    In both ADE XL and Explorer/Assembler, you can (in the Monte Carlo options) click on the Specify Instances/Devices so that your common devices only have mismatch applied. For process, it's fine - the process conditions of both simulations would be the same - but you need to set a common set of blocks to apply mismatch to so that they correlate.

    The challenge is if you have additional components in your bigger circuit - they then won't have mismatch applied, but presumably the calibration is not sensitive to that.

    If you  need something more complex, please contact customer support.

    Regards,

    Andrew.

  • HansB
    in reply to Andrew Beckett

    Hi Andrew,

    Thanks.

    So if main tb contains hierarchies A B C D E and tb for calibration uses hierarchies B C a correlation can be set such that for each MC iteration the same mismatch variations will be applied to B C in main tb and B C in calibration tb. But when now running main tb no mismatch variation will/can be applied to hierarchies A D E ?

    I had expected the main tb to be the "master" (all devices undergoing MC mismatch) while the correlation set ensuring that in the calibration tb designated blocks receive the same mismatch as in the master.

    kind regards

    Hans

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