Re: [SI-LIST] : High Speed AC Coupling

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From: Michael Nudelman (mnudelman@tellium.com)
Date: Tue Oct 31 2000 - 14:46:57 PST


Alex:

For 2.5 Gigs AC block we use general purpose de-coupling caps, 0603 or 0805,
X7R, and they work just fine.

Mike.

"Golian, Alexander" wrote:

> Help!
>
> I am designing with an optical transponder that is designed to accept a PECL
> level electrical signals at 2.5GB/s. The driver outputs CML level
> electrical signals. I have to AC couple the signal to make the voltage
> levels compatible. The vendor said any old 0.01uf capacitor would do, but I
> can't beleive this. I would expect a general purpose capacitor at 0.01uf to
> become increasingly inductive past 1GHz already. I would expect that the
> capacitor would have to be good out to 12GHz as to not attenuate the first 5
> harmonics. Does anyone out there have a good suggestion? I have seen some
> very wide band DC blocks. What, if any, is the difference between a DC
> blocking cap, and a AC coupling cap?
>
> Thanks
>
> Alex
>
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