"P.R.Dewasthalee" wrote: > > Hi all, > > I feel the best way to close the argument about the "split" > is to invoke a lot of discussion on EM related topics! > > Fortunately, I have a lot of doubts to clarify! > *********************************** > > In CML/pCML/ECL/pECL logic families, we see a differential > output with even mode operation. I mean, CML/pCML sink currents > on both the lines(T/F) whereas ECL/pECL source current on both > lines(T/F). (Even Mode). > > Comparing this with LVDS, the current is sourced out of one line > and is returned on the other one. (Odd mode). > > I can understand the benefits of differential pair in the odd mode > operation (Flux Cancellation). > > Question is: > Does the same phenomenon occur in the even mode also?
This is actually a signal integrity question. Unless you're implying that even produces common mode currents which are the source of much radiation problems. The same phenomenon? I'd say no. Even mode produces the "magnetic wall", i.e. no tangential magnetic fields. Odd produces the "electric wall", i.e. no tangential electric fields. Clearly two entirely different phenomena at work. What is interesting and not seemingly well known is that characteristic impedance and crosstalk can be explained with even/odd mode impedances. > Please give me some clue, any further references to look. Quite an exhaustive account in terms of microstrip design in reference to even and odd modes with plenty of associated references is given in .... Title: Practical Microstrip Circuit Design Authors: L.A. Trinogga, Guo Kaizhou, I.C. Hunter List-Post: [email protected] Date: 1991 ISBN: 0-13-580077-3 Publisher: Ellis Horwood Limited Market Cross House, Cooper Street CHichester, West Sussex, PO19 1EB, England Regards, Doug McKean ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: [email protected] Michael Garretson: [email protected] For policy questions, send mail to: Richard Nute: [email protected]
