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About unregular shape in layout: Cadence CAD and fabrication

My question is: in virtuoso GUI it is allowed to draw any shapes with basically any angles. For example, a quasi circle (polygon by defining number of sides). However, the DRC of many technologies has restriction of angles, generally 45 and 90 degrees. So I am wondering if the shapes with angles other than 45 and 90 degrees can still be fabricated. I know by not following the design rules there could be risks of a fail chip, but I just need to know whether such kind of design can be accepted by the fabrication company like mosis (I didn't find a certain rejection about this case in mosis Q&A). Any information is appreciated. Thanks.

Sincerely,

bjbit

Quek over 13 years ago

Hi bjbit

It is usually not advisable to have such shapes in the layout but the question of whether they can be fabricated can only be answered by your foundry support. : )

Best regards
Quek
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bjbit over 13 years ago

Hi Quek,
Thanks for your response. I have figured this one out. They do require all the layout shapes on grid for generating mask layer. Off grid is not allowed.
Sincerely,
bjbit
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