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No connection for Nwell

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ani16

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Hi all,
I have a doubt . In p-substrate there is a nwell which is not been connected to any potential . There is no device inside the nwell. But still there will be an error that all nwell have to be connected . What could be the reason for it .
 

Put an n+ implant region into the nwell and connect it via a contact to M1 and with it to VDD!
 

Sir ,
I do not have a doubt how to connect but my doubt is why that error is present
 

Why have a NWELL with nothing inside of it? The assumption is that a device will be inside the nwell. So, all nwell will need to be connected to some potential.
 

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