Stats

  • State Not Answered
  • Replies 1
  • Subscribers 159
  • Views 10537
  • Members are here 0
More Content

Differential pair spacing DRC

kakri

Hello,

I have defined a differential pair having a primary gap of 6 mil and I wanted line to line spacing 20 mil. The both nets are defined as differential pair and the constrains are applied. I was able to draw the differential pair with the required primary gap (6 mil) but a line to line spacing DRC error is coming mentioning 

"

Constraint value: 20 MIL

Actual value: 6 MIL

 "

Kindly provide a solution. 

  • 0

    When routing differential pairs with a gap less than the line-to-line spacing constraint, you must set the Min Line Spacing column value to be equal to the smallest diffpair gap including any neck gaps and (-) Tolerance settings to get rid of the L-L DRCs.

    Here is an example for reference:

    Typical line-to-line spacing = 10.00

    Primary gap = 8.00

    Neck gap = 6.00

    (-) Tolerance = .01

    Min Line Spacing = 6.00 - .01

           = 5.99
     

    Once the "Min Line Spacing" is specified correctly, the L-L DRCs will not be generated.

Cadence Guidelines

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.