Multiple power in RF design

[CADillac]

Hi
I have multiple ground in a RF environment. They get shorted through
the substrate with the ptie. I have to create a PSUB2 layer to put
around these multiple power blocks to isolate the sub around a
particular transistor to prevent LVS shorting. What is the simplest
"logic" for such a code ( in Calibre or Assura )that I can add to a
existing deck without disturbing it too much...This question has
probably been asked many time but I cannot find it in the archive... i
appreciate your resposnse.

Best regards

 

[G Vandevalk]

This depends on how the deck codes the substrate at present!

Typically you could copy the code for the substrate conductor
into another layer (PSUB2!) and then "connect" the PSUB2
islands to the "Substrate" layer with the "device" created by a copy of
PSUB2.

(then recode each connection to the substrate in each device to connect
to the PSUB2 conductor and create a "tiedown" 2 terminal device betweeen
each PSUB2 supply and the global substrate.)

(make the tiedown2 unseen by lvs!)

- Gerry




"CADillac" <hoangngocduc@gmail.com> wrote in message
news:1111075589.078548.314740@z14g2000cwz.googlegroups.com...

Hi
I have multiple ground in a RF environment. They get shorted through
the substrate with the ptie. I have to create a PSUB2 layer to put
around these multiple power blocks to isolate the sub around a
particular transistor to prevent LVS shorting. What is the simplest
"logic" for such a code ( in Calibre or Assura )that I can add to a
existing deck without disturbing it too much...This question has
probably been asked many time but I cannot find it in the archive... i
appreciate your resposnse.

Best regards