momcap PDK floating nwell?

[sharkies]

Hi, I'm using an momcap from the PDK

It has a poly layer throughout the bottom(below M1 layer of course), which I connect to ground.
This is equivalent to the third terminal in the schematic 'symbol' view.

Howver, I'm not sure what to do with the bottom nwell.
It is floating and when I do LVS it gives an error on floating.nxwell_float in the ERC result.
Do people usually tie this a VDD?
Or do people just keep'em floating?

Thanks

 

[erikl]

Hi, I'm using an momcap from the PDK

It has a poly layer throughout the bottom(below M1 layer of course), which I connect to ground.
This is equivalent to the third terminal in the schematic 'symbol' view.

I don't think so: I think this is the bottom layer of the cap.

Howver, I'm not sure what to do with the bottom nwell.

This is the 3^rd terminal, IMHO.

It is floating and when I do LVS it gives an error on floating.nxwell_float in the ERC result.
Do people usually tie this a VDD? Or do people just keep'em floating?

No, it has to be tied to VDD.

 

[xlowen]

Hi sharkies,

I also have the same ERC error. How did you clean the error?

Thanks

Hi, I'm using an momcap from the PDK

It has a poly layer throughout the bottom(below M1 layer of course), which I connect to ground.
This is equivalent to the third terminal in the schematic 'symbol' view.

Howver, I'm not sure what to do with the bottom nwell.
It is floating and when I do LVS it gives an error on floating.nxwell_float in the ERC result.
Do people usually tie this a VDD?
Or do people just keep'em floating?

Thanks