[SI-LIST] Re: PCB Material clarifications
- From: <karthikeyavelan.kandasamy@xxxxxxxxx>
- To: <star_wang1@xxxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Sat, 7 Apr 2012 06:23:46 +0000
Hi
Thanks,
There are not same length.
We understood that QPI equalizer changing based on good result.
Anyway we are meeting the requirements. So we closed our simulations and
planning to release the Gerber.
Thanks to all.
Regards
karthik
From: wangsuhua [mailto:star_wang1@xxxxxxxxxxx]
Sent: Saturday, April 07, 2012 5:50 AM
To: Karthikeyavelan Kandasamy (WT01 - PES-SYST-WNL); si-list@xxxxxxxxxxxxx
Subject: RE: [SI-LIST] Re: PCB Material clarifications
hello$B!'(B
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>
> [mailto:si-list-bounce@xxxxxxxxxxxxx]<mailto:[mailto:si-list-bounce@xxxxxxxxxxxxx]>
> On Behalf Of Vinu Arumugham
> Sent: Friday, March 16, 2012 10:43 PM
> To: si-list@xxxxxxxxxxxxx<mailto: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>
> > [mailto:si-list-bounce@xxxxxxxxxxxxx]<mailto:[mailto:si-list-bounce@xxxxxxxxxxxxx]>
> > On Behalf Of
> > karthikeyavelan.kandasamy@xxxxxxxxx<mailto:karthikeyavelan.kandasamy@xxxxxxxxx>
> > Sent: Friday, March 16, 2012 10:31 AM
> > To: weirsi@xxxxxxxxxx<mailto:weirsi@xxxxxxxxxx>;
> > si-list@xxxxxxxxxxxxx<mailto: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>
> > [mailto:si-list-bounce@xxxxxxxxxxxxx]<mailto:[mailto:si-list-bounce@xxxxxxxxxxxxx]>
> > On Behalf Of steve weir
> > Sent: Friday, March 16, 2012 1:31 PM
> > To: si-list@xxxxxxxxxxxxx<mailto: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<mailto: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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> > --
> > Steve Weir
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