assura diode lvs issue "floating "nxwell" not

assura diode lvs issue

floating "nxwell" not allowed..

anybody got this error b4??

Deepak.

Re: assura diode lvs issue

deepak242003 said:

anybody got this error b4??

Click to expand...

No. We don't let wells floating. You should check accurately! Could be lethal.

thanks for the reply erik1..

I should have explained it clearly..
It is wiht respect to diode like this..

-!>|-!>|-

For the first diode I am getting this error... since the nwell(cathode) is not connected to any power ,we might be getting this error...

Can we ignore this error this time?? what u suggest??


Deepak.

Re: assura diode lvs issue "floating "nxwell"

deepak242003 said:

-!>|-!>|-

For the first diode I am getting this error... since the nwell(cathode) is not connected to any power ,we might be getting this error...

Can we ignore this error this time??

Click to expand...

Yes, in this case you may ignore it, because the nwell is self-biased. In order to inhibit the error message, you could stick a global name to it, like e.g. "biasp!" or "vddp!". I think this should disable the invalid error message.

Re: assura diode lvs issue "floating "nxwell"

erikl said:

In order to inhibit the error message, you could stick a global name to it, like e.g. "biasp!" or "vddp!". I think this should disable the invalid error message.

Click to expand...

should I add it in layout or netlist... If in layout , wiht nwell layer ??

deepak.

Re: assura diode lvs issue "floating "nxwell"

deepak242003 said:

should I add it in layout or netlist...

Click to expand...

In layout should be sufficient, but I'm used to add names in both schematic & layout. Helps the LVS, and also helps you, if you would have to make changes after half a year or so ;-)

deepak242003 said:

If in layout , wiht nwell layer ??

Click to expand...

Depends on the PDK. Some want the very (same) layer, some want a PIN layer. Make it as you are used to, or simply try it!

deepak242003 said:

-!>|-!>|-

Click to expand...

PS: I hope the diodes are operated in forward direction!? Serial connection in reverse direction wouldn't necessarily work well for symmetrical voltage division. And anyway you couldn't achieve a larger serial reverse voltage than the process allows for.