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Maximum value achieved

ishah

During DC simulation of an NMOS tsmc40 on IC618, I got number of warning and notices. One of the warning is " maximum value achieved for for any signal of each quantity: V; V(I0, Q) = 902.1 mv, I; 7.006 uA. How to get rid of this notice ? is it serious ? how will it affect the silicon results ?

  • Hi,

    I think this is not a warning message but an information added at the end of each analysis type. Just check if the numbers are within the 
    limits you expect for your circuit. Kind of a safety feature for you to not miss high-voltage/high-current  conditions in the circuit which could damage
    the devices.

    Kind regards,

    Marc

  • in reply to Marc Heise

    Hello Marc,

    Thanks for the detailed reply. Yes, its good to have a check. But as long as the voltage is less than max voltage (like 1.1v in this case) and current is less than the maximum current the nmos can handle, such notices should be suppressed. I don't know how to configure. But, your clarification certainly did run away my worry, Thanks.

  • in reply to ishah

    How would we know what your maximum expected voltage and current are? If a voltage source is the highest voltage that's what's reported (so there isn't a 1.1V source in your case because otherwise that would be the maximum), but even then I've seen cases where somebody puts a very large voltage source in the circuit (sometimes for feeding into an ideal A2D say) and that impacts accuracy - they may have forgotten it's there.

    The information is there because high quantities can cause convergence and accuracy challenges, and so making the user aware of them is useful. I really cannot see why you object to being told useful information - it's not a warning (or even a "notice") - it's just information printed in the log file. Having an option to turn off this information would be total overkill.

    Andrew

  • in reply to Andrew Beckett

    Got your point as why this information is highlighted in the log file. Thanks for the comments. 

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