Hello, my LDO design was passing LVS correctly unt...
# ihp-sg13g2d
Daniel Arevalos
05/16/2024, 1:29 PMHello, my LDO design was passing LVS correctly until I added a guardring to the OTA. Now the LVS detects the nmos as rfnmos. How could I solve this ?
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Boris Murmann
05/16/2024, 7:27 PMDo you have the heatrans layer on your device? I think that layer is used to distinguish.
Boris Murmann
05/16/2024, 7:29 PMThe same issue will exist for all transistors on the chip once you add the seal ring (which has a guard ring).
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Daniel Arevalos
05/16/2024, 8:09 PMI'm utilizing Klayout pcells, which include the heatTrans layer.
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Boris Murmann
05/16/2024, 8:12 PMInteresting. I thought the new LVS would handle this properly. You may want to file an issue. I ended up hacking the LVS to take out the RF device recognition altogether.
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Farag Elsayed
05/17/2024, 1:10 PMThe heattrans layer is no longer used for identifying the regular FETs and now the only difference between the regular and RF FETs is the surrounding taps.
Cc @Amro Tork @Krzysztof Herman
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Amro Tork
05/17/2024, 6:15 PM@Boris Murmann @Daniel Arevalos We have brought this to IHP attention and it’s under active discussion. We believe that we would need a marker layer for RF mosfet to be recognized.
Amro Tork
05/17/2024, 6:15 PMAnyhow, please file an issue for us to track.
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Daniel Arevalos
05/18/2024, 2:00 PM@Boris Murmann Could you please show me how did you manage to take out the recognition of the RF devices?
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Amro Tork
05/18/2024, 3:59 PM@Daniel Arevalos This is a known bug for us as I mentioned above. Please just open an issue on github and ignore it for now.
Amro Tork
05/18/2024, 4:01 PM@Daniel Arevalos If you created a cut in the ptap whole it will go away. But that’s not the right behavior for LVS.
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Boris Murmann
05/18/2024, 5:35 PMBoris Murmann
05/18/2024, 5:35 PMThis is just a temp hack.
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