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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

    Yaman,

    It sounds rather unlikely that the simulator would be making such a huge error unless there was something fundamentally wrong in your simulation setup or more likely in the circuit or test bench itself. Circuit simulators (even when asked to run with very loose tolerances) typically don't make such gross errors. So without seeing your circuit, it's hard to know what the problem is - as I said. I suggest you talk to your supervisor, because clearly something is wrong, and if nobody can see it, nobody will be able to point you in the right direction.

    Regards,

    Andrew.

Reply
  • Andrew Beckett

    Yaman,

    It sounds rather unlikely that the simulator would be making such a huge error unless there was something fundamentally wrong in your simulation setup or more likely in the circuit or test bench itself. Circuit simulators (even when asked to run with very loose tolerances) typically don't make such gross errors. So without seeing your circuit, it's hard to know what the problem is - as I said. I suggest you talk to your supervisor, because clearly something is wrong, and if nobody can see it, nobody will be able to point you in the right direction.

    Regards,

    Andrew.

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