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How to copy and rotate a shape with special angle like 30 degree in skill coding?

richardyuan

Hello, 

I failed to search the manual and the forum to find a way to copy and rotate a shape I created with any agle like 15, 30, 45 etc.

I noticed some posts said that rotate with any angle may raise lithography issues. But in MEMS application, it's very popular to use all kinds of "strange" shapes. As the line/space is over 1um, the litho problem can be neglected. Then, what can I do in skill code?

 Thanks. 

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  • I'm guessing that you're rotating each shape incrementally, which would mean you accumulate rounding errors. You didn't share your code, so that's purely a guess.

    I wrote the following:

    procedure(CCFcreateRotatedShape(cv layerName angle inner outer width)
        let((tempCv)
            tempCv=dbOpenCellViewByType(cv~>libName cv~>cellName "scratch" "maskLayout" "w")
            dbCreateRect(tempCv layerName list(inner:-width/2.0 outer:width/2.0))
            dbTransformCellView(tempCv 1.0 angle)
            foreach(shape tempCv~>shapes
                dbCopyFig(shape cv list(0:0 "R0" 1))
            )
            dbClose(tempCv)
            t
        )
    )

    procedure(CCFrotateExample(@key (cv geGetEditCellView()) (spines 20) (inner 25) (outer 45) (width 4)
                (layer1 "Metal3") (layer2 "Metal2"))
        let((radius)
            radius=(inner+outer)/2.0
            dbCreateEllipse(cv layer1 list(-radius:-radius radius:radius))
            for(i 0 sub1(spines)
                CCFcreateRotatedShape(cv layer2 i*360.0/spines inner outer width)
            )
        )
    )

    And then ran (using gpdk090):

    CCFrotateExample(?spines 19 ?layer1 "Via2" ?layer2 "Via5")

    (purely to get some pretty colours). As you can see, this looks pretty evenly spaced and the shapes look regular:

    The setup has 2000 DBUPerUU so has a good level of resolution - I don't know what your database resolution is compared with the size of your structure.

    Regards,

    Andrew.

Reply

  • I'm guessing that you're rotating each shape incrementally, which would mean you accumulate rounding errors. You didn't share your code, so that's purely a guess.

    I wrote the following:

    procedure(CCFcreateRotatedShape(cv layerName angle inner outer width)
        let((tempCv)
            tempCv=dbOpenCellViewByType(cv~>libName cv~>cellName "scratch" "maskLayout" "w")
            dbCreateRect(tempCv layerName list(inner:-width/2.0 outer:width/2.0))
            dbTransformCellView(tempCv 1.0 angle)
            foreach(shape tempCv~>shapes
                dbCopyFig(shape cv list(0:0 "R0" 1))
            )
            dbClose(tempCv)
            t
        )
    )

    procedure(CCFrotateExample(@key (cv geGetEditCellView()) (spines 20) (inner 25) (outer 45) (width 4)
                (layer1 "Metal3") (layer2 "Metal2"))
        let((radius)
            radius=(inner+outer)/2.0
            dbCreateEllipse(cv layer1 list(-radius:-radius radius:radius))
            for(i 0 sub1(spines)
                CCFcreateRotatedShape(cv layer2 i*360.0/spines inner outer width)
            )
        )
    )

    And then ran (using gpdk090):

    CCFrotateExample(?spines 19 ?layer1 "Via2" ?layer2 "Via5")

    (purely to get some pretty colours). As you can see, this looks pretty evenly spaced and the shapes look regular:

    The setup has 2000 DBUPerUU so has a good level of resolution - I don't know what your database resolution is compared with the size of your structure.

    Regards,

    Andrew.

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