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 Parametric analysis - voltage error in the netlist 

Last post Mon, Apr 28 2014 11:22 AM by Seokhyun Jeong. 2 replies.
Started by Seokhyun Jeong 28 Apr 2014 02:04 AM. Topic has 2 replies and 188 views
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  • Mon, Apr 28 2014 2:04 AM

    Parametric analysis - voltage error in the netlist Reply

    I found that when I run parametric sweep with fine voltage step, netlists are sometimes generated with wrong value. For example, when I run parametric analysis with the voltage changing from 0 to 1V with 1/2560V(=390.625uV) step, 62.5mV is changed to 62.4999999999998V in the netlist. 

    Is there some kind of precision issue during parametric sweep? Is there a way to fix this? I am currrently using ic-6.1.5.-64b.500.9

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    • Post Points: 20
  • Mon, Apr 28 2014 9:21 AM

    Re: Parametric analysis - voltage error in the netlist Reply

    Why does this really matter? It's accurate to 3 parts in a million billion (1e15), so that ought to be good enough for all practical purposes... (that's the limit of floating point precision, so you're seeing a floating point rounding error).

    Regards,

    Andrew.

    • Post Points: 20
  • Mon, Apr 28 2014 11:22 AM

    Re: Parametric analysis - voltage error in the netlist Reply

    No, It doesn't matter as you said. I just found this while running an ADC with ideal components. I was not getting ideal codes, so was curious why.

    Thanks for the answer.

     

    • Post Points: 5
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Started by Seokhyun Jeong at 28 Apr 2014 02:04 AM. Topic has 2 replies.