[SI-LIST] Aalog or Digital

From: Bob Patel <whizplayer@xxxxxxxxx>
To: si_list <si-list@xxxxxxxxxxxxx>
Date: Mon, 24 Sep 2001 10:07:33 -0700 (PDT)
Hi! Thanks for the responses and I stress the same
view point to the concerned engineers but I think they
are on the path of over tightning their design without
understanding the basics of planes, bypass, proper
layout etc. 
Thanks
Bob
--- steve weir <weirsp@xxxxxxxxxx> wrote:
> Bob,
> 
> If your engineers are trying to say that LVPECL, or
> LVDS are analog 
> signals, that is obviously not so.  What it sounds
> like they are trying to 
> do is isolate noise on the high speed diff.
> subsystems from that in the 
> single-ended CMOS logic.  Isolating the grounds is a
> poor option for this, 
> and I cannot think of a good case for it.  If they
> use one ground, and 
> properly: bypass, place and route their signals they
> will achieve the 
> benefits that they are after.
> 
> Regards,
> 
> Steve.
> 
> At 06:06 PM 09/20/2001 -0700, you wrote:
> 
> >Hi! I had a question regarding analog signals
> >i.e.analog signals are signals whose amplitude
> varies
> >continuous with time.
> >Now, my question is can I calssify LVPECL, LVDS
> >signals as analog signals or as digital. I know
> what
> >to classify it as according to my understanding but
> I
> >needed some opinions on this.
> >Now, why do I ask this because some engineers are
> >trying to put lvpecl or lvds under analog and now
> try
> >to connect these chips to agnd which I diagree and
> say
> >it is much better to have a single gnd rather than
> >having separate gnd and then worry about connecting
> >them.
> >Thanks in advance
> >Bob
> >p.s I am might be wrong but at least I will be back
> on
> >the right path.
> >
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[SI-LIST] Aalog or Digital

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