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Forums > Silicon-package-board > Signal Integrity and Modeling

Subject: SERIOUS convergence problem in simulation
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nikhilbny
Posts: 0
Online: User is Offline
8/17/2006 8:03 AM  
when i try to simulate net in specctraquest during post simulation at pulse 133mhz  i find this error

"warning: SERIOUS convergence problem in simulation"

can any one tell me the reason- this is becos of model or something else

how can i remove this so that i can simulate the net and check the waveform
Kalevi2
Moderator
Posts: 69
Online: User is Offline
8/17/2006 9:07 AM  
I don't know your topology but some things you can try:
a) Just drive the output into the input over a simple T line at your operating frequency. If you get the same error, remove the v-t curves and see if it works.
b) If the output into the input works, start adding the bits of your topology to see where it fails.
c) Also, try to change the time step setting to a finer time step.
Kai Keskinen
Donald Telian
Posts: 42
Online: User is Offline
9/05/2006 1:49 PM  
You should also look in the tlsim.log file down in your /sim directory since it will often give you additional information. Other than that, Kai's suggestion to try subsets of your circuit is a good one.
Donald Telian
SI Consultant
telian@sti.net
559-760-5793
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Forums > Silicon-package-board > Signal Integrity and Modeling > SERIOUS convergence problem in simulation


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