All,
Will some one shed some light on why differential lines (to and from) a ECL
device are AC coupled? I've been unsuccessful at finding an answer from my
internet searches.
I am speaking specifically to the AC coupling that is found in fibre-channel
ser-des transmitters.
(P)ECL C1
|\-------------o-----||---
| \ |
| / | C2
|/o------o-----------||---
| |
| |
< R1 >R2
> <
| |
| |
_|_ _|_
GND GND
Where C1=C1=0.01uF
Why is the capacitor needed? What is the theory behind this implementation?
Thanks,
--------------------------------------------------------
_ __ Salvador Aguinaga Jr.
/_/ )/ _| Carrier Systems Group
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=B7 R&D
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