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RobertZ

Community Member

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the art of analog

Posts: 55
San Diego, CA

Notice from spectre
Jun 27^th, 2005, 4:41pm

dear all,

during a 'tran' analysis, one message like the following is shown:

*************
Notice from spectre at time = 6.01534 us during transient analysis 'tran'. Maxium value for quantity 'I' has increased to 1.06973 uA (detected at V0:p)

Notice from spectre at time = 6.43504 us during transient analysis 'tran'. Maxium value for quantity 'I' has increased to 10.73333 uA (detected at V0:p)

Notice from spectre at time = 48455 us during transient analysis 'tran'. Maxium value for quantity 'I' has increased to 110.903 uA (detected at V0:p)

**************
,where V0 is the power supply (DC).

What does this kind of notice mean? what is the meaning of "Maxium value for quantity 'I' " ?

Thanks,
-driveforce

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Thanks,
Robert

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Ken Kundert

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Posts: 2386
Silicon Valley

Re: Notice from spectre
Reply #1 - Jun 28^th, 2005, 12:59am

The quantity "I" is current. What this message is saying is that the maximum current detected in the circuit is increasing in a suspicious way. If it is okay for the maximum I in your circuit to be > 110uA then then don't worry about the message.

I believe this the trigger value for this message is set using a parameter on the quantity statement (see 'spectre -h quantity' for more information.

-Ken

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RobertZ Community Member Offline the art of analog Posts: 55 San Diego, CA	Re: Notice from spectre Reply #2 - Jun 28^th, 2005, 9:24am Ken, Thank you. Since the simulation includes a power on step, the high instantaneous current can be around 110 uA. Best, -driveforce
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Geoffrey_Coram Senior Fellow Offline Posts: 1999 Massachusetts, USA	Re: Notice from spectre Reply #3 - Jun 30^th, 2005, 5:31am Does it really say "Maxium" (instead of Maximum)? Too bad there isn't an easy way to run the text of messages through a spell-checker -- if you run the whole source code, all the oddly-named variables show up. But a quick "grep" could find this typo so it can be corrected.
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John O Donovan Junior Member Offline Posts: 29 San Jose, CA	Re: Notice from spectre Reply #4 - Jun 30^th, 2005, 11:29am Hi, Since simple mistakes like this are somewhat annoying, I checked the message, and it says "Maximum" as far back as the history goes, so it should be fine. :) John
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