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 Difficulty in simulating mtline model. 

Last post Tue, Jul 13 2010 10:24 AM by Tawna. 3 replies.
Started by Valay 06 Jul 2010 04:39 PM. Topic has 3 replies and 2608 views
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  • Tue, Jul 6 2010 4:39 PM

    • Valay
    • Not Ranked
    • Joined on Tue, Jul 6 2010
    • Posts 2
    • Points 40
    Difficulty in simulating mtline model. Reply
    Hello all,

    Recently I was trying to simulate mtlline model in Spectre. I was trying this by writing the following netlist:

    simulator lang=spectre

    I1 (0 1) isource type=pulse val0=0 val1=1 period=1m rise=500n fall=500n width=500u

    x1 (1 2 0) mtline len=1

    +r=[1]

    +c=[1n]

    .model mtmodel mtline

    +r=[1]

    +c=[1n]

    scope tran stop=10m maxstep=1u

    But I am getting an comment saying "No path from node 1 to ground, Gmin is installed". Due to this the output graph (time versus voltage) shows static value of 100M (installed Gmin).

     
    Does anyone can tell me how to prevent this Gmin from getting installed?

    Thanks a lot in advance.
    • Post Points: 20
  • Mon, Jul 12 2010 12:21 PM

    • Tawna
    • Top 25 Contributor
    • Joined on Thu, Jul 10 2008
    • Snohomish, WA
    • Posts 217
    • Points 5,775
    Re: Difficulty in simulating mtline model. Reply

     Hi Valay,

     

    While this will not directly answer your question...I strongly recommend downloading the mtline appNote from Cadence On-line Support.  

    http://support.cadence.com/wps/mypoc/cos?uri=deeplinkmin:DocumentViewer;src=wp;q=ApplicationNotes/Custom_IC_Design/mtlineAN.pdf

     The way you have your parameters in your netlist set up indicate that you would benefit from the information in this comprehensive  appNote.

     

    best regards,

     

    Tawna

    Best regards, Tawna Wilsey Staff Support AE, Global Customer Support Cadence Design Systems, Inc.
    • Post Points: 20
  • Tue, Jul 13 2010 10:05 AM

    • Valay
    • Not Ranked
    • Joined on Tue, Jul 6 2010
    • Posts 2
    • Points 40
    Re: Difficulty in simulating mtline model. Reply
    Dear Tawna,

    Thank you very much for your help. But I need to have the server host ID in order to access the document you are referring to. Since I am using the University's license I am not sure where can I get that. I will be grateful to you if you can send it to me.

    Thanks a lot again.

    Regards,
    Valay.
    • Post Points: 20
  • Tue, Jul 13 2010 10:24 AM

    • Tawna
    • Top 25 Contributor
    • Joined on Thu, Jul 10 2008
    • Snohomish, WA
    • Posts 217
    • Points 5,775
    Re: Difficulty in simulating mtline model. Reply

     Hi Valay,

    Your university will have a contact person whom you can contact to get the username and password.  They can retrieve the document for you.  In fact, there is a ton of good information on Cadence OnLine Support - you really need to get on there and browse.   There are answers to many typical user questions.

    Having said that, if you send me your email address, I'll forward the appNote to you since I'm the author.

    best regards,

    Tawna (tawna@cadence.com)

    Best regards, Tawna Wilsey Staff Support AE, Global Customer Support Cadence Design Systems, Inc.
    • Post Points: 5
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Started by Valay at 06 Jul 2010 04:39 PM. Topic has 3 replies.