Re: adaptive equalizers for LVDS data over CAT5
- From: Rene Tschaggelar <none@xxxxxxxx>
- Date: Mon, 17 Sep 2007 22:15:16 +0200
John Larkin wrote:
On Sun, 16 Sep 2007 23:52:58 +0200, Rene Tschaggelar <none@xxxxxxxx>
wrote:
Winfield wrote:
John Larkin wrote:
What we need here is a thread on adaptive equalizers for
LVDS data over CAT5. Anybody working with that?
That would be a great topic. How about the efforts made to
equalize TV or color-monitor signals sent over CAT5, that
might be a good start, or is it likely their bandwidth would
have been inadequate? Tell us your specs.
Whoever,
why not have a slower clock to distribute and PLL
it up locally ? Targetting low phase noise I guess.
Nevertheless the skew stays the same. I'd counter
that with a MC100EP196, a digital delay chip to stay
flexible. On the other hand Onsemi has clock
distribution solutions that are thought to counter
clock skew.
We could do that, but we still need the triggers to be unambiguous as
to which 400 MHz cycle they fire on. So if we did distribute something
slower, the edge rates would still need to be ballpark 1ns to make
sure we don't slip a cycle. Given the parts available nowadays, it
seems pretty simple to just pump 200 or 400 MHz around.
It's a more general issue of how well one can pump logic-level signals
around, between racks maybe, using cheap, available parts, with one
candidate being LVDS over Cat5 cables and connectors.
John,
in order to have distributed strictly synchroneous
operation, I guess you'd need a master controller
and equal cable lengths to all units. Once you have
the cables equally long, you can take a 100EP196
to delay one signal against the other. Then feed
two channels, one arbitrarily delayed onto a mixer
and adjust until the integral is zero. This way
you can adjust the timeing to subnanosecond precision.
Rene
--
Ing.Buero R.Tschaggelar - http://www.ibrtses.com
& commercial newsgroups - http://www.talkto.net
.
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- From: Rene Tschaggelar
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- From: John Larkin
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