LTspice tutorial - Differential transmission lines

[@giorgiocanal1659]

Your job here is absolutely underrated. Thanks for sharing.

[@Daniel-sc4xt]

Good explanation. I am surprised at how many things you can do with LTspice. Great job.

[@天天学习-v1x]

Thank you. By setting slightly longer Td's at the lines coupled with GND (in the 1st simpler model), FEXT, which appears on microstripline, can be reproduced. It is a quite discovery to me😃

[@jeffkirsten7009]

Very useful. Thank you for posting this.

[@ghlscitel6714]

Impressive clarity. Congrats. Do you have Spice Parameters For e.g. a CAT5 or a USB3.1 cable?

[@openFrimeTv]

good job colleague

[@robertdockweiler8664]

Very informative! I'm curious how you would go about simulating lossy transmission lines. I tried using the LTSpice "ltline" component but it says you have to add the .model which looks like you need the ltra.MDL file and I have been unable to find it or figure out how to create it and where to put it.

[@FesZElectronics]

Actually, for the ltline, you can make a very basic model like the example in the help file (and throw this as a command into the simualtion): .model MyLossyTline LTRA(len=1 R=10 L=1u C=10n) there are some other possible parameters, but these 4 are the main ones you need.

[@ivegotpetercriss]

Thank you

[@maksymkloka7819]

Hmmm. The equation for Zcm = Z2||Z2 sort of was intuitive to make sense of. The equation for Zdiff = Z1||(Z2+Z2) was a bit harder for me to understand. Could you explain how this equation was derived?

[@FesZElectronics]

Well, it has to do with the direct and indirect link between the 2 lines; Z1 is the direct link; and Z2+Z2 is the link trough ground - so there the link from L1 to GND which is in series with the link from GND to L2. Finally these 2 links are in parallel, so its Z1||(Z2+Z2)

[@kieranj67]

Thank you