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Reliability analysis - custom models

Michal Sovcik

Dear guys,

I am trying to perform reliability analysis in Cadence Virtuoso, however the foundry do not provide AgeMOS models for process node, I use. So my question is: Is there please a workaround to reach at least approximate results of NBTI, HCI, ageing effects on circuit?
For example, I suppose I could define analytical equations of mentioned phenomenons. Results will be far from fitting real data, but I need to see just a trend. If there is similar solution, somebody can explain me, my tremendous thank would belong to him :)

I work in Cadence 6.1.7.

Kind regards,
Michal Sovcik

  • Andrew Beckett

    Hi Michal,

    You could construct some model parameters for your devices, but this is not going to be terribly meaningful if it's not based on characterised data. Effectively you need to define an agemodel with sets of parameters. You could borrow these age model definitions and adapt them to your own model names:

    <SPECTRE191_instDir>/tools/relxpert/example/ade/ic615_reliability_spectre/model_spectre/relxpert_model.scs

    However, this is probably pointless. Those are (really) made-up models on a  made-up process so applying them to a different real technology almost certainly doesn't buy you anything. You could implement your own reliability equations using URI (Universal Reliability Interface) but this is a load of work and really not worthwhile if you've got no measured data on aging to characterise against.

    Andrew.

  • Michal Sovcik
    in reply to Andrew Beckett

    Hi Andrew,

    this is what I looked for. I definitely understand, this example model has nothing with PDK, I use. I must at least try to tailor it and it is great help for just a move forward.

    Many thanks!

    Regards,
    Michal

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