[SI-LIST] Re: PCB Material clarifications
- From: wangsuhua <star_wang1@xxxxxxxxxxx>
- To: <karthikeyavelan.kandasamy@xxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Sat, 7 Apr 2012 08:19:33 +0800
hello£º
you describe the qpi is bad , the pcie3 is good,but they are the same length
and topology? Did you do simulation before design system. maybe you can change
one of daughter card with megtron-4.
> From: karthikeyavelan.kandasamy@xxxxxxxxx
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Re: PCB Material clarifications
> Date: Mon, 19 Mar 2012 12:27:49 +0000
>
> Hi all,
>
> Thanks to all.
>
> We have done the simulation using ISOLA 307HR and Megtron-4.
> The Interfaces are PCIe gen3 and QPI Gen3(8Gbps)
>
> PCIe 3 results are good what we expected, But QPI results not our
> expectations.......
>
> QPI topology :
> Daughter card (4" channel) - Plannar (3" channel) - Daughter card (4"
> channel)
>
> Our plan is Daughter card is ISOLA and Plannar is Megtron.
>
> Today we have done the IL, RL and ICR measurement on the channel. The results
> are
>
> QPI LINK LOSS REPORT
> ISOLA Megtron ISOLA & Megtron
> Return loss in dB -28.8 -45.5 -29.4
> Insertion loss in dB -10.2 -5.46 -8.94
> ICR in dB 35.1 37.7 36
>
>
> Regards
> Karthik
>
>
>
>
>
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
> Behalf Of Vinu Arumugham
> Sent: Friday, March 16, 2012 10:43 PM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Re: PCB Material clarifications
>
> Karthik,
>
> You may also want to clarify exactly what materials you are using Megtron 6
> or Megtron 4?
> Isola 620 or FR406?
>
> Low loss materials can increase jitter due to reflections.
> High loss materials can increase jitter due to ISI.
> Perhaps, you are observing that the "sweet spot" is the mixed case?
>
> Thanks,
> Vinu
>
> On 03/16/2012 02:42 AM, Moreira, Jose-Antonio wrote:
> > Hello Karthik
> >
> > This kind of comparison cannot be done on the time domain using parameters
> > like jitter and Eye height (there are too many variables on those type of
> > measurements). You need to do it in the frequency domain using a VNA.
> >
> > Also, you need to make sure the trace width on all experiments is exactly
> > the same to make sure the skin-effect loss is the same (adjusting the
> > stackup of course to have the same impedance on all experiments).
> >
> >
> > Jose
> >
> >
> > -----Original Message-----
> > From: si-list-bounce@xxxxxxxxxxxxx
> > [mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of
> > karthikeyavelan.kandasamy@xxxxxxxxx
> > Sent: Friday, March 16, 2012 10:31 AM
> > To: weirsi@xxxxxxxxxx; si-list@xxxxxxxxxxxxx
> > Subject: [SI-LIST] Re: PCB Material clarifications
> >
> > No, but we are meeting the Impedance is same (85 ohms)
> >
> > Regards
> > Karthik
> >
> >
> > -----Original Message-----
> > From: si-list-bounce@xxxxxxxxxxxxx
> > [mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of steve weir
> > Sent: Friday, March 16, 2012 1:31 PM
> > To: si-list@xxxxxxxxxxxxx
> > Subject: [SI-LIST] Re: PCB Material clarifications
> >
> > Have you EXACTLY matched the dielectric thickness for each scenario?
> >
> > Steve.
> > On 3/16/2012 12:47 AM, karthikeyavelan.kandasamy@xxxxxxxxx wrote:
> >> Hi Experts,
> >> We have done the simulation with different materials ( 1. Isola 2. Megtron
> >> 3. Isola& megtron (mixed)) and results are below.
> >>
> >> Here we are seeing the eye height of mixed material(isola and
> >> Megtron) is more than Megtron Our expectation is Megtron should be more
> >> compared to other materials.
> >>
> >> Could you please comment on this.
> >>
> >> Isola Material result:
> >> Eye height : 68mv
> >> Eye width: 32ps
> >>
> >> Megtron Material result:
> >> Eye height : 72mv
> >> Eye width: 34ps
> >>
> >> Isola and Megtron Material result:
> >> Eye height : 78mv
> >> Eye width: 34ps
> >>
> >> Thanks in advance.
> >>
> >> Regards
> >> Karthik
> >>
> >>
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