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Subject: Simple formulas for first approximation of dual stripline differential impedance-do they exist?

Date: 09/27/03 at 4:25 PM
Posted by: John W. Childers
E-mail: goldengategraphics@prolynx.com
Message Posted:

I am grappling with differentical impedance. I have formulas for stripline and microstrip differential impedance from National. But I have been unable to find any formulas specifically for dual or asymetric stripline differential impedance.

The board houses we use have advanced modeling software for achieving the impedance requirements. I am just trying to get a first approximation for PCB trace geometry.

Does any of you know of any reference that contains formulas for dual or asymetric stripline differential impedance?

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