[PCB_FORUM] Re: high speed board material.

  • From: <sjcharles@xxxxxxx>
  • To: <icu-pcb-forum@xxxxxxxxxxxxx>
  • Date: Mon, 21 Feb 2005 17:09:32 -0500

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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