petros85
Newbie level 3
Hi all. I have runt into a DRC error :
MAXIMUM n+ DIFFUSION TO NEAREST p+ PICKUP SPACING(INSIDE P-WELL OR TWELL) IS 20um
I know this is resolved by adding taps or a guard ring around the device. Problem is that I get this error for one device that is quite big. So no matter how close I place the psub contacts I get the error marking the inside middle area of the device (that is further away than 20um from the taps.) There must be a way around this except resizing the nmos. (it is a diff pair in a one-line common centroid and I have tried to make it as square as possible)
Also I am using umc18nm process and I can't automatically create guard ring. It says guard ring template not set. So I manually placed psub contacts around the devices. In my smaller devices it worked nicely. Any advice on how to set the automatic guard ring creation?
MAXIMUM n+ DIFFUSION TO NEAREST p+ PICKUP SPACING(INSIDE P-WELL OR TWELL) IS 20um
I know this is resolved by adding taps or a guard ring around the device. Problem is that I get this error for one device that is quite big. So no matter how close I place the psub contacts I get the error marking the inside middle area of the device (that is further away than 20um from the taps.) There must be a way around this except resizing the nmos. (it is a diff pair in a one-line common centroid and I have tried to make it as square as possible)
Also I am using umc18nm process and I can't automatically create guard ring. It says guard ring template not set. So I manually placed psub contacts around the devices. In my smaller devices it worked nicely. Any advice on how to set the automatic guard ring creation?