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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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  • ymn2009

    Hello Andrew,


    I am using cadence spectre simulator on cadence2012 virtuoso ADE. I have setup a transient analysis and am trying to note down the voltages that I am running through the ADC and the digital codes that my ADC is generating. When I have a longer simulation time (vis 5+ us) with a longer ramp the codes that I am getting are in the steps of 128 (which is loss of 7bits) where as if I am using a smaller simulation time (viz 2us) I am getting codes as expected.

    I hope I have been able to convey what I am trying to achieve.

    Please let me know of additional information I should give. I am new to the forum and IC design as such.

    Thanks

    Yaman 

Reply
  • ymn2009

    Hello Andrew,


    I am using cadence spectre simulator on cadence2012 virtuoso ADE. I have setup a transient analysis and am trying to note down the voltages that I am running through the ADC and the digital codes that my ADC is generating. When I have a longer simulation time (vis 5+ us) with a longer ramp the codes that I am getting are in the steps of 128 (which is loss of 7bits) where as if I am using a smaller simulation time (viz 2us) I am getting codes as expected.

    I hope I have been able to convey what I am trying to achieve.

    Please let me know of additional information I should give. I am new to the forum and IC design as such.

    Thanks

    Yaman 

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