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Creating rectangles with rounded corners in Layout using SKILL (PCell)

HI,

I have written some code to generate the layout of a p-cell high-voltage transistor. All shapes created are rectangles (like the active, contact, metal layers).

While measuring the devices it was found that the break-down voltage was really low, much lower than anticipated. One of the solutions that has already been tested, and has been proven to be very effective, is to create rounded corners for some of the layers involved. The layouts to test this were all generated manually. No it is my task to put that (rounding the corners) in the p-cell.

Is there an easy solution to convert a rectangle in a rounded-corner rectangle? Something like this already exists in Cadence as a SKILL procedure? If not I just have to come-up with something clever myself...

With kind regards,

Sjoerd

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Andrew Beckett over 9 years ago
Hi Sjoerd,

There's no built-in function to do this within a PCell (there's leModifyCorner, but that can't be used in a PCell). So you'd have to write something to do this yourself.

However, this is easily done using Virtuoso PCell Designer. I added one command to my existing transistor pcell (this is a silly example - just did it because I didn't have anything more relevant to had):

Virtuoso PCellDesigner is a Cadence services product - we have quite a few customers for it world wide now. You can find a little more about it from these CDN Live presentations:

PCell Class Library for Use Over Different Process Nodes by Using PCell Designer and Object Oriented Programming

Hierarchical Module Design With Cadence PCell Designer

Jumping analog layout productivity and accuracy with PCell

I'd be happy to give you a demo (the tool is developed by my team) if you're interested (send me a friend request on the forum - note, this is not an invitation to everyone to send me a friend request; I get too many people sending me friend requests with questions in which they could have posted in the forums; I only accept friend requests when I have asked people to contact me this way so that we can get in touch directly).

Regards,

Andrew.
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Andrew Beckett over 9 years ago
Hi Sjoerd,

There's no built-in function to do this within a PCell (there's leModifyCorner, but that can't be used in a PCell). So you'd have to write something to do this yourself.

However, this is easily done using Virtuoso PCell Designer. I added one command to my existing transistor pcell (this is a silly example - just did it because I didn't have anything more relevant to had):

Virtuoso PCellDesigner is a Cadence services product - we have quite a few customers for it world wide now. You can find a little more about it from these CDN Live presentations:

PCell Class Library for Use Over Different Process Nodes by Using PCell Designer and Object Oriented Programming

Hierarchical Module Design With Cadence PCell Designer

Jumping analog layout productivity and accuracy with PCell

I'd be happy to give you a demo (the tool is developed by my team) if you're interested (send me a friend request on the forum - note, this is not an invitation to everyone to send me a friend request; I get too many people sending me friend requests with questions in which they could have posted in the forums; I only accept friend requests when I have asked people to contact me this way so that we can get in touch directly).

Regards,

Andrew.
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