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 Editing CDF parameters for a MOS device 

Last post Tue, Oct 7 2008 7:38 AM by aplumb. 3 replies.
Started by Usuomi 05 Oct 2008 01:05 AM. Topic has 3 replies and 7217 views
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  • Sun, Oct 5 2008 1:05 AM

    • Usuomi
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    • Joined on Sun, Oct 5 2008
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    • Points 75
    Editing CDF parameters for a MOS device Reply

    Hello-  I using Virtuoso Schematic Editor 5.10.41 to simulate a digital circuit.  I need to vary the size of an NMOS device.  I write a variable name (i.e. wtry) into the W field for example.  When I simulate (Eldo simulator) I get the following error: ERROR 1510: W parameter cannot be defined both as a string and as a real value.   The .cir file puts my MOS variable as a string (i.e. "wtry"). 

    Each time I run eldo I need to remove all the quotations in my .cir file.  Please help.  How do I get rid of this problem?  If I have to remove these quotations one more time I am going to go crazy ... lol.

     Thanks,

    Usuomi 

    • Post Points: 20
  • Mon, Oct 6 2008 12:31 AM

    • Bernd
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    • Unterhaching, Bavaria
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    Re: Editing CDF parameters for a MOS device Reply

     I guess the CDF atribute 'parseAsNumber' for your parmater "wtry" will do the job.
    You have to edit your NMOS CDF and add it to the paramter "wtry".

    Component Description Format User Guide:

    parseAsNumber specifies whether this parameter can evaluate to a floating-point
    number. Use this attribute only for string type parameters that contain numeric
    data.

    If parseAsNumber is yes, the system converts the string to a floating-point
    number, converts the floating-point number to the most efficient notation for
    execution, and reconverts the floating-point number into a string.

     Bernd

    Just another lonesome cad guy
    • Post Points: 20
  • Tue, Oct 7 2008 6:01 AM

    • Usuomi
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    • Joined on Sun, Oct 5 2008
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    Re: Editing CDF parameters for a MOS device Reply

    Thanks for the advice. Unfortunately, I was unable to find the 'parse asNumber option' in the CDF attribute area of 'Edit Object Properties' menu.  There is only Width, Length, etc.

      

     

     

     

    • Post Points: 20
  • Tue, Oct 7 2008 7:38 AM

    • aplumb
    • Top 75 Contributor
    • Joined on Wed, Jul 16 2008
    • Ottawa, Ontario
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    Re: Editing CDF parameters for a MOS device Reply

    You have to edit the CDF itself, not just instance/object properties.

     CIW - Tools - CDF - Edit

    See the Component Description Format User Guide for all the details:  IC5.1.41 or IC6.1.3.

     Andrew.

    • Post Points: 5
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Started by Usuomi at 05 Oct 2008 01:05 AM. Topic has 3 replies.