error on bad component subtype deep n-well NMOS

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allennlowaton

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Good day friends,

I would like to ask help regarding this error from the layout.
I using TSMC 0.18um 1P6M process.
My design requires an NMOS with a shorted source and bulk.

Thank you.
 

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allennlowaton said:
Good day friends,

I would like to ask help regarding this error from the layout.
I using TSMC 0.18um 1P6M process.
My design requires an NMOS with a shorted source and bulk.

Thank you
Click to expand...

I also have this error.
The type or subtype of the device is not recognized.

I did try to match extracted device with the netlist file.
and it works for me!

Cheers!

 
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If you put NMOS in a DNW/VNW pocket then its body is cut
off from the bulk / handle Psub and you will have to route the
body (tap) explicitly to open field and a ptap there.

What value do you imagine putting it in a DNW pocket is,
when you intend to jumper it to the substrate in the end?
You eat a lot of layout area for nothing (except perhaps
substrate noise control).
 
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Thank you for the feedback.
My application requires the shorted source and bulk NMOS that will avoid the body effect.
 

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So then you do not want source tied to "bulk" (which is the
handle Psub / Pepi) but the local body "pocket" (Pepi inside
DNW/VNW). That may want you to use a 4T FET symbol and
wire it explicitly; the 3T may have an inherited sub! connection
that you either can't modify or can't find?

P- inside DNW is not the same "node" as sub!.
 

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