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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

  • Krishna,

    You appear to be getting confused about what ID does what.

    First of all, the result of dbOpenCellViewByType is not a window id. It's a cellView id. Whilst the variable name doesn't matter, calling it windowID is just confusing.

    Secondly, you would want to set the w and l on an instance id (i.e. the return value ofdbCreateInst). Setting it on a cellView id makes no sense.

    So you probably want:

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

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

    instID=dbCreateInst(cellViewID masterID "I0" 1:1 "R0" 1)

    instID~>w="10u"

    instID~>l=" 130u"

    For example.

    Regards,

    Andrew.

Reply

  • Krishna,

    You appear to be getting confused about what ID does what.

    First of all, the result of dbOpenCellViewByType is not a window id. It's a cellView id. Whilst the variable name doesn't matter, calling it windowID is just confusing.

    Secondly, you would want to set the w and l on an instance id (i.e. the return value ofdbCreateInst). Setting it on a cellView id makes no sense.

    So you probably want:

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

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

    instID=dbCreateInst(cellViewID masterID "I0" 1:1 "R0" 1)

    instID~>w="10u"

    instID~>l=" 130u"

    For example.

    Regards,

    Andrew.

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