[SI-LIST] Re: AC coupling placement

Usually the AC coupling capacitor would need a couple of vias to connect
to the lines. Reflections from this structure can be lowered by placing
it near the receiver where the edge rate is slower than at the
transmitter.

If you do not have very long run lengths (>100 bits), a 0.01uF will
work.

Thanks,
Vinu

Ben Rothchild wrote:

> Hello Experts,
>
> I have a question on AC coupling.
> While AC coupling a high speed serial
> link to match levels, where should
> the AC coupling capacitor be placed.
> Close to transmitter/close to receiver/
> or doesn't matter, can be placed
> anywhere on the link.
>
> What should be the value of the AC
> coupling capacitor or rather how
> do I calculate it. Is it dependent on
> frequency. I am trying to AC couple
> signals of 155M, 622M, 1.25G and 2.5G.
> Any special care to be taken at these
> different frequencies.
>
> Thanks for any advice.
> Ben
>
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