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Subject: Time: 9:33 AM
OFFICE MEMO DES: True Differential Striplines Date: 6/6/96
Hi all, we have a problem finding the design requirements (formulas) for true
differential strip transmission lines, see the following sketch
sgsgsgsgsgsgsgsgsgsgs -- the sg's are signal grounds (planes)
ddddddddddddddddddddd -- the d's are dielectric
ddddddddddddddddddddd
ddddddddsssssssdddddd -- the s's are signal layers (superimposed)
ddddddddddddddddddddd
ddddddddsssssssdddddd
ddddddddddddddddddddd
ddddddddddddddddddddd
sgsgsgsgsgsgsgsgsgsgs
We have done a bunch of literature searches to find the formulas to model
differential transmission lines to no avail.
The differential transmission line impedance we are needing is in the range of
20-50 ohms.
We think the signal ground planes have minimal impact on the impedance of the
differential transmission line.
Any help/thought will be appreciated, and thanks a lot, ahead of time.
Ralph Hersey
Lawrence Livermore National Laboratory
e-mail: [log in to unmask]
If possible "cc" (close copy) your response to:
Jim Zumstein
e-mail: [log in to unmask]
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