Re: [SI-LIST] : Reference for decision of characteristic impedance

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From: Michael Nudelman (mnudelman@tellium.com)
Date: Mon Dec 04 2000 - 10:09:21 PST


Il
Often times it is dictated by the chips you use. Since they may be
on-chip-terminated, the termination impedance is defined by chip
manufacturer and you have to match your impedance to it.

So this is why most hi-speed schematics (2.5 Ghz i.e.) have 100 Ohm
diff. impedance for the diff pairs.

Mike.

IL SEONG wrote:

> Hello All,
>
> When you decide standard characteristic impedance of your PCB,
> how decided it?
> If you have some document or reference, please let me know it.
> Looking for your help.
> Thanks a lot in advance.
>
>
>
> IL SEONG
> SAMSUNG Electronics Co.
> Business Innovation, E-CIM Team
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