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 Zero Diagonal Matrix in Jacobian on Net-x 

Last post Tue, Aug 12 2014 9:26 AM by Andrew Beckett. 1 replies.
Started by RFStuff 30 Jul 2014 11:31 PM. Topic has 1 replies and 489 views
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  • Wed, Jul 30 2014 11:31 PM

    • RFStuff
    • Top 25 Contributor
    • Joined on Tue, Feb 5 2013
    • Posts 253
    • Points 4,485
    Zero Diagonal Matrix in Jacobian on Net-x Reply

     Dear All,

    I am finding  Zero Diagonal Matrix in Jacobian on I0/I117/I11/I5/12/I1/net05,I0/I117/I11/I5/12/I1/net05 . It I am running with APS enabled. I know it is created because of open or shorted loop node.

    But when I checked this node it is neither floating nor a short loop node.

    Is there any other reasons why Zero Diagonal Matrix in Jacobian error comes ?

    Kind Regards

    • Post Points: 20
  • Tue, Aug 12 2014 9:26 AM

    Re: Zero Diagonal Matrix in Jacobian on Net-x Reply

    This generally is an indication that you have an ill-conditioned matrix, which is often caused by having non-isolated solutions. This can be because you have floating parts of you circuit - which means there is potentially an infinite continuum of solutions, and this is a problem for convergence.

    It can also be an issue with certain loops (e.g. loops of ideal inductors, voltage sources in parallel and so on). The topology checker will find many (but not all) of these.

    I'd suggest that you contact customer support so that we can take a look at your example and give some directed advice?

    Regards,

    Andrew.

    • Post Points: 5
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Started by RFStuff at 30 Jul 2014 11:31 PM. Topic has 1 replies.