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How to size transistors using SKILL

KrishnaPraveen

Hi!

 I wanted to know how one can size a transistor schematic using SKILL.

 I am using these commands but I want to know how I can size the transistors, I read the CDSDOC but could not figure out:

windowID = dbOpenCellViewByType("test_schematic" "skillSchematic" "schematic" "schematic" "w")

masterID = dbOpenCellViewByType("analogLib" "nmos4" "symbol")

dbCreateInst(windowID masterID "I0" 1:1 "R0" 1)

These commands creates an nmos in the schematic view but I want to be able to size it.

 I tried doing this which I read in some code (though it does not make sense to me) :

windowID~>w="10u"

windowID~>l="130u"

 I think I am doing something fundamentally wrong.

I want to be able to size the transistors as I place them in the shematic.

 Any help is highly appreciated.

 

Thank You.

Krishna

 

  

Parents

  • Andrew, I think I am close.

    The behaviour that I am observing is, the width and the length does not change in the CDF Parameter list after I do this:

    instID~>w="10u"

    instID~>l=" 130u"

    These values are put next to the instance (I read one of your older posts.)

    These get changed once I go to the instance properties->"Modify"->"Apply". Then the values are changed in the CDF Parameter list.

    But this does not automate the sizing process. So how can I modify the values?

     I tried : cdfID = cdfGetInstCDF(instID), using this callback it does not let me modify the attributes.

     

     

Reply

  • Andrew, I think I am close.

    The behaviour that I am observing is, the width and the length does not change in the CDF Parameter list after I do this:

    instID~>w="10u"

    instID~>l=" 130u"

    These values are put next to the instance (I read one of your older posts.)

    These get changed once I go to the instance properties->"Modify"->"Apply". Then the values are changed in the CDF Parameter list.

    But this does not automate the sizing process. So how can I modify the values?

     I tried : cdfID = cdfGetInstCDF(instID), using this callback it does not let me modify the attributes.

     

     

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