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]