Differential Impedance Definitions
♦ Single-Ended Impedance (Zo)
Impedance on a single line with respect to
ground when not coupled to another line (Zo = Square root of Zodd Zeven)
♦ Differential Impedance (ZDIF)
The impedance on one line with respect to the coupled line, when the
lines are driven by equal and opposite signals
♦ Odd Mode Impedance (ZOdd)
Impedance on a single line with respect to ground when the other
coupled line is driven by equal and opposite signals (ZDIF = 2ZOdd)
♦ Common Mode Impedance (ZCM)
Impedance of the two lines combined with respect to ground
♦ Even Mode Impedance (ZEven)
The impedance on one line with respect to ground when the coupled
line is driven by an equal and in-phase signal (ZEven = 2ZCM)
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