[PCB_FORUM] Re: high speed board material.
- From: "richard moffat" <richard.moffat@xxxxxxxxxxxxxxxxxxx>
- To: <icu-pcb-forum@xxxxxxxxxxxxx>
- Date: Wed, 23 Feb 2005 08:52:48 +1300
You can still use Studio for a lot of things - it will just take a bit
longer and things like timing rules will be a lot more manual.
Actually, if you're not dealing with multiple processors on a board and
complex topologies, you can sometimes get away with just good
engineering practices.
Have fun an good luck!
>>> sjcharles@xxxxxxx 23/02/2005 3:25:08 a.m. >>>
this is new for us and we're using studio.
>
> From: "richard moffat" <richard.moffat@xxxxxxxxxxxxxxxxxxx>
> Date: 2005/02/21 Mon PM 05:20:17 EST
> To: <icu-pcb-forum@xxxxxxxxxxxxx>
> Subject: [PCB_FORUM] Re: high speed board material.
>
> Wow, that's fast. Time to apply all your SI and EMC knowledge, and
then
> some!
>
> >>> sjcharles@xxxxxxx 22/02/2005 11:09:35 a.m. >>>
> sorry about the edge rate i think that should be around 50 pico sec.
> >
> > From: "richard moffat" <richard.moffat@xxxxxxxxxxxxxxxxxxx>
> > Date: 2005/02/20 Sun PM 02:52:42 EST
> > To: <icu-pcb-forum@xxxxxxxxxxxxx>
> > Subject: [PCB_FORUM] Re: high speed board material.
> >
> > Hi
> >
> > Yeah, similar - we run up to 3.125GHz at the moment. The biggest
> thing
> > we have to worry about is loss and skin effect.
> >
> > Are you sure the edge rate is 9ns? That's huge. For PCI it
> probably
> > should be ~ 200-300 ps or so, at a guess, depending on the chip
> > technology.
> >
> > Cadence put put GHz simulation tools, but they are expensive.
> >
> > Cheers,
> > Richard
> >
> > >>> austin@xxxxxxxxxxxx 19/02/2005 11:49:32 a.m. >>>
> > Hi,
> >
> > FR-4 is fine for your specs below. I have FR-4 boards that run
> > Infiniband
> > 4x (2.5GHz x 4 signal lanes), and no problem. That's the highest
> I've
> > gone
> > on FR-4. I do suggest you do simulation though, and you pay
careful
> > attention to routing rules.
> >
> > BTW, 1GHz better have better than a 9ns edge rate, or you won't
get
> > any
> > signal ;-)
> >
> > Austin
> >
> >
> > > -----Original Message-----
> > > From: sjcharles@xxxxxxx [mailto:sjcharles@xxxxxxx]
> > > Sent: Friday, February 18, 2005 11:37 AM
> > > To: icu-pcb-forum@xxxxxxxxxxxxx
> > > Subject: [PCB_FORUM] Re: high speed board material.
> > >
> > >
> > > speed 1 ghz, 8 ly, 1/2 oz, rate edge approx 9n, 5/5 width and
> > > spacing maybe 4
> > > for necking. two or threes pair controlled Z. If Fr4 will do the
> > > job then i that
> > > would be fine.
> > >
> > > thanks
> >
> >
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