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Transient simulation accuracy

ymn2009

Hi, 

I am trying to simulate an ADC and while noting all the codes that are generated while applying a ramp input to the system I am getting different results for different simulation time. 

If I am running a 2us transient analysis (with a smaller voltage ramp) I am getting accurate results for the sampled voltage and while running proportional ramp for 10us I am getting different outputs for the region where the voltage ramp is same. Is there some simulation parameter I need to look for. The simulation results for all the accuracy settings (moderate, conservative and liberal) are same. I need to simulate for a 500mV ramp over the time of ~1.6ms. So its impractical to simulate it in chunks of 2us. Can anyone please help in this situation. 

Thanks

ymn2009

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  • Andrew Beckett

    There are a couple of simulation parameters which are a function of the simulation duration (e.g. maxstep) however, I would be surprised if these had a significant effect.

    Trying to guess the problem without seeing anything (you didn't mention which simulator, which version, or indeed much information at all about the simulation setup) is going to be very hard. This is probably best handled by going to customer support.

    Kind Regards,

    Andrew.

Reply
  • Andrew Beckett

    There are a couple of simulation parameters which are a function of the simulation duration (e.g. maxstep) however, I would be surprised if these had a significant effect.

    Trying to guess the problem without seeing anything (you didn't mention which simulator, which version, or indeed much information at all about the simulation setup) is going to be very hard. This is probably best handled by going to customer support.

    Kind Regards,

    Andrew.

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