Hi All,
I was extracting 4 port S parameters for differential signal on FR4 PCB
trace referenced to ground with connector and vias in the trace path.
S21 is having resonance at 10GHz where the S parameter file is single ended
version, while same S21 does not have resonance at 10GHz when the single
ended version is converted to mixed mode S-parameters using simulation
tools.
The resonance is expected due to discontinuity in the path but both P & N
of the differential signal is having same discontinuity, hence both P & N
are seeing same amount of insertion loss. Single ended impedance is 50 ohms
while differential impedance is 90 ohms.
So was wondering what is causing a differential signal not have resonance
compared to single ended signal leaving apart the mathematics used in
conversion to mixed mode :-)
Regards
Vinod A H
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