[SI-LIST] Series termination: common mode

I still have one question (please don't be annoyed).

In all these structures, even with on-chip bypass capacitors,
I suspect the common-mode will still not be properly terminated

For example in the Figure 29 (of SATA 1.0a specs) though
structure 1 will easily provide 100ohm differential
termination, both the pins are proper 50ohm only if the ground
connection has very small inductance, which is very difficult.
And I don't think bypass capacitor can help in this. So how is
this sort of thing managed?

Vinayak
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