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Differential Impedance--What’s

消耗积分:0 | 格式:rar | 大小:555 | 2010-01-15

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Differential Impedance--What’s the Difference?:Just when you thought you had mastered Zo, the characteristic
impedance of a PCB trace, along comes a data sheet
that tells you to design for a specific differential impedance.
And to make things tougher, it says things like: “… since the
coupling of two traces can lower the effective impedance, use
50 Ohm design rules to achieve a differential impedance of
approximately 80 Ohms!” Is that confusing or what!!
This article shows you what differential impedance is.
But more than that, it discusses why it is, and shows you how to make the correct calculations.

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