Stats

  • Locked Locked
  • Replies 3
  • Subscribers 127
  • Views 14912
  • Members are here 0
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

CDL netlisting series resistors as multiple instances

RFdog

Greetings,
 
I'm using a standard resistor model with W, L, NumSeries, and NumParallel as parameteres.  All works well on the simulation side.  
 
Due to company guidelines, LVS will not combine series resistor devices.  i.e. if I have 5 series resistors, each of which is 10u x 1u, I must have the exact same in the layout, not just a single 50x1 device.  The problem is that the CDL netlister creates a single 50x1 device which then doesn't match to the 5 10x1 devices in the layout.
 
Other folks here get around the problem by instantiating 5 individual devices in the schematic (each of 1 unit).  Things get pretty messy when the number of series devices gets large, as it often does.
 
Being somewhat new to this company, I think this practice is bizarre, and would like to find a way to force the CDL netlister to look at the number of series resistors (a CDS parameter), and just export them as N unit devices connected in series.  Seems like it could be easily done, but I have no idea how.
 
any help? 
Parents Reply Children
No Data

Community Guidelines

The Cadence Design Communities support Cadence users and technologists interacting to exchange ideas, news, technical information, and best practices to solve problems and get the most from Cadence technology. The community is open to everyone, and to provide the most value, we require participants to follow our Community Guidelines that facilitate a quality exchange of ideas and information. By accessing, contributing, using or downloading any materials from the site, you agree to be bound by the full Community Guidelines.