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OPA365-Q1: OPA365: Spice model not able to run monte-carlo variations

Xinchao Liu
Prodigy 120 points
Part Number: OPA365-Q1

The existing spice model in TI database, doesn't support monte-carlo variations, would it be possible to support by providing a revised model which can support MC variations ?

  • 0
    TI__Genius 15326 points

    Hi Xinchao,

    My colleague did make a sub-circuit that would allow an amplifier model to run a Monte-Carlo simulation of input offset voltage, but I haven't used it yet for any amplifier models. I don't know of any model that also includes standard deviation information for parameters in addition to input offset voltage. 

    Although we usually treat the datasheet's typical input offset voltage as a DC value in the model, in reality this value is 1 standard deviation, and the bell curve is truncated at the max and min values. For a monte carlo analysis, the offset distribution of offset voltages should be centered around 0V.

    You can use a DC voltage source to cancel out the model's internal input referred offset voltage, and then use a second input DC voltage to act as the offset voltage with the standard deviation specified.

    Best regards,

    Sean