高速差分阻抗 Differential Impedance
What’s the Difference?
Douglas Brooks
Zo i
Just when you thought you had mastered Zo, the charac-
(a)
teristic impedance of a PCB trace, along comes a data sheet
that tells you to design for a specific differential impedance. Z11 i1 ki2
1
And to make things tougher, it says things like: “… since the
coupling of two traces can lower the effective impedance, use 2
……
