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Differential Signals in FDTD/FEM SImulations

Question asked by BarrettP Employee on Sep 2, 2015
Latest reply on Sep 2, 2015 by BarrettP

Has anyone worked with differential signals in either of the simulation domains? I think the way to make it work in FEM is to create a waveguide port, and draw your impedance lines as 2 different modes (I think I saw this somewhere, but I don't remember where). I was also given a piece of code that converts these 4 port S-parameters to even & odd mode parameters, although I'm not sure where this came from. Is there something similar for the FDTD engine? It seems that when I have a pair of differential signals (two feeds) and I simulate in the time domain to look at the TDR, it is no different that if I were to make one port a feed and the other a passive component. This makes sense, since it only activates one feed at a time when it is simulation. Is there a way to declare two ports as differential signals, and have them simulate together?