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

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From: Omar Al-Taher (omart@avxus.com)
Date: Thu Nov 02 2000 - 05:55:45 PST


HI Alexander,
   If you're having problems with regular capacitors, AVX offers single
layer capacitors that would do the job at these frequencies since their
resonance frequencies are much higher than 2.5Ghz.

Omar Al Taher
Applications Engineer
AVX Corporation
801 17th Ave S.
Myrtle Beach, SC 29578
Tel: (843) 444-2811
Fax: (843) 626-3015
Email: omart@avxus.com
www.avxcorp.com

-----Original Message-----
From: owner-si-list@silab.eng.sun.com
[mailto:owner-si-list@silab.eng.sun.com]On Behalf Of Tom Dagostino
Sent: Tuesday, October 31, 2000 7:22 PM
To: 'Golian, Alexander'
Cc: si-list@silab.eng.sun.com
Subject: RE: [SI-LIST] : High Speed AC Coupling

DC block and AC coupling are two terms for the same thing. One is a
negative and the other a positive -- half empty/half full.

Look at the problem as a voltage divider between the complex Xc of the
coupling cap and the Zin of the receiver. As long as enough of the signal
from the source is impressed across the receiver it should work.

I would also make sure the low frequency cut-off of the system matches your
bandwidth requirements.

Tom Dagostino
IBIS and Tau Modeling Manager
SDD
Mentor Graphics Corp.
503-685-1613
tom_dagostino@mentor.com

-----Original Message-----
From: owner-si-list@silab.eng.sun.com
[mailto:owner-si-list@silab.eng.sun.com]On Behalf Of Golian, Alexander
Sent: Tuesday, October 31, 2000 1:45 PM
To: si-list@silab.eng.sun.com
Subject: [SI-LIST] : High Speed AC Coupling

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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