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The average metal Z0 is not the same as the effective impedance of a trace. The Average Zo is Average impedance of the whole trace
7 c0 z* Z) _6 v- T4 zThe "effective Z0" is a figure that attempts to show by how much the selected nets actual characteristic impedance is effectively lowered by the presence of IC capacitance along the net and associated nets. This value can be used as a guide when choosing termination resistances, since for nets that are significantly loaded by IC capacitance, the proper termination value is almost always lower than suggested by the nets actual Z0.' ]3 C k, ~9 t8 a" y1 t0 c/ _
. s# b8 w8 P& W: I/ l& q, q走线的impedance（Z0) 受到IC impedance 影响= Effective Impedance.
# f) b! H2 E: o2 z+ } o% _Effective Impedance 一般比走线Impedance 低 |
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发表于 2011-10-16 16:00
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