[SI-LIST] Re: PECL vs LVDS
- From: Jim G Roberts <jgroberts@xxxxxxxxxx>
- To: Andrew.Ingraham@xxxxxx
- Date: Wed, 09 Apr 2003 18:01:54 +0200
Hi ,
I am not sure of the questionaires intention but PECL was introduced by
Motorola as a high frequency standardmany years ago when high speed was in the
order of 1ns. It featured a low output impedance to allow for series termination
to reduce power dissipation.
This is not realistic for sub nanosec and a new standard was developed with a
reduced swing and thus power. And a matched impedance output.
Analogue devices such as optical drivers and receivers still tend to use
these standards whereas IC's are changing over.
For high bitrate [>2GB] with long lines a new standard CML is in vogue. This
sometimes employs pre-emphasis to overcome the skin effects, etc.
--
Regards, __________ James G Roberts
/___ ____ | jrobert@xxxxxxxxxxxxxxxxxxxxx
Jim __ / /___/ / jgroberts@xxxxxxxxxx
/ /_/ /---| | Room: BE436, Hilversum
\____/ /_/ Tel: +31 35 687 4308 Fax: 5976
====================================================
"Ingraham, Andrew" wrote:
> > IS PECL used for optical transmission only and LVDS for copper lines?
> >
> > Can PECL be used for Copper ie electrical interface? need some
> > details on
> > this?
>
> PECL is electrical. It is not an optical interface.
>
> I have used PECL only for electrical signals where there was no optical
> line involved. In my case they were for board traces only, not long
> copper lines.
>
> Andy
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