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Exceeding blowup limit 1GV! (Read 3078 times)

jefkat Community Member Offline Posts: 69	Exceeding blowup limit 1GV! May 03^rd, 2007, 5:57am Hi folks, I was running a transient sim on a DAC when Spectre quit saying voltage at a node exceeded 1GV (the blowup limit). I dont have a nuclear reactor inside my DAC so this must be some simulator thing. Can anyone please tell me how to avoid these kind of pesky things? thanks much for your taking time to reply. shaf
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ACWWong Community Fellow Offline Posts: 539 Oxford, UK	Re: Exceeding blowup limit 1GV! Reply #1 - May 3^rd, 2007, 7:19am classic example of this is an ideal current source, where the current has no where (except via gmin) to go and thus creating blow up voltages... investigate the nodes reported in the spectre log.
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Ken Kundert Global Moderator Offline Posts: 2386 Silicon Valley	Re: Exceeding blowup limit 1GV! Reply #2 - May 3^rd, 2007, 8:28am I have also seen this when there is a negative time constant (due to a negative resistor or the like) causing exponential growth. Try setting diagnose=yes on the options to find the problem. -Ken
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jefkat Community Member Offline Posts: 69	Re: Exceeding blowup limit 1GV! Reply #3 - May 4^th, 2007, 12:28am Thanks a lot guys!
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