[SI-LIST] Re: 14 Layer Stackup
- From: "Lee Ritchey" <leeritchey@xxxxxxxxxxxxx>
- To: "Xilei Liu" <xileil@xxxxxxxxxxx>, jain.nitin@xxxxxxxxx
- Date: Tue, 20 Jun 2006 10:35:10 -0700
Everytiing is this reply is good except the inplication that there will be
an EMI problem.
> [Original Message]
> From: Xilei Liu <xileil@xxxxxxxxxxx>
> To: <jain.nitin@xxxxxxxxx>; <leeritchey@xxxxxxxxxxxxx>
> Cc: <si-list@xxxxxxxxxxxxx>
> Date: 6/19/2006 12:36:27 PM
> Subject: RE: [SI-LIST] Re: 14 Layer Stackup
>
> Hi Jain,
>
> What's the signal operation frequency and which Vdd is the main power
plane
> (the one with greatest power supply)? I think it is better not to have
Vdd1
> in layer 3 sanwiched by two signal planes. The main power plane should be
> beneath a Gnd, and the high-speed signal plane should be close to Gnd,
> otherwise the image current will go through the capaictance between the
> signal plane and GND, which will form a loop and cause EMI problem.
>
> Celine
>
>
> >From: <jain.nitin@xxxxxxxxx>
> >Reply-To: jain.nitin@xxxxxxxxx
> >To: <leeritchey@xxxxxxxxxxxxx>
> >CC: <si-list@xxxxxxxxxxxxx>
> >Subject: [SI-LIST] Re: 14 Layer Stackup
> >Date: Mon, 19 Jun 2006 20:34:26 +0530
> >
> >
> >Hello Lee,
> >
> >Thanks for the information. I had thought about the stackup you just
> >suggested. I have a issue with this stackup. I have lot of high speed
> >differential nets to be routed and if I use the stackup you suggested
> >I'll have to route in board side coupled fashion which is not easy (in
> >terms of cost, reliability etc). What do you think if I have some kind
> >of following arrangement:
> >Top 1
> >Signal 2
> >Plane 3 Vdd1
> >Signal 4
> >Plane 5 Gnd
> >Plane 6 Vdd2
> >Signal 7
> >Signal 8
> >Plane 9 Gnd
> >Plane 10 Vdd3
> >Signal 11
> >Plane 12 Gnd
> >Signal 13
> >Bottom 14
> >
> >I think you might not very comfortable with Vdd1 in layer 3. What issues
> >I can face if I go with above stackup.
> >
> >With regards,
> >Nitin
> >=0D
> >-----Original Message-----
> >From: Lee Ritchey [mailto:leeritchey@xxxxxxxxxxxxx]=0D
> >Sent: Monday, June 19, 2006 8:14 PM
> >To: Nitin Jain (WT01 - Broadband Networks); si-list@xxxxxxxxxxxxx
> >Subject: RE: [SI-LIST] 14 Layer Stackup
> >
> >Jain,
> >
> >I'd suggest you change the stackup as I have shown below. Then, I'd
> >make layer assignments as shown.
> >
> >
> > > [Original Message]
> > > From: <jain.nitin@xxxxxxxxx>
> > > To: <si-list@xxxxxxxxxxxxx>
> > > Date: 6/19/2006 10:01:00 AM
> > > Subject: [SI-LIST] 14 Layer Stackup
> > >
> > >
> > > Hello,
> > >
> > > We are planning to use 14 layer stackup for our design. In our stackup
> >
> > > we have total 6 planes and we are planning to use 3 planes as power=0D
> > > planes and hence we are left with 3 gnd planes. Now I want to know
is=0D
> > > there any defined strategy to assign planes as pwr or gnd. In other=0D
> > > words which plane should be assigned as pwr and which should be=0D
> > > assigned as gnd.=3D0D =3D0D The 14 layer stackup looks like this:
> > >
> > > Top 1 top
> > > Signal 2 Signal
> > > Plane 3 Plane Gnd
> > > Signal 4 Plane Vdd1
> > > Plane 5 Signal
> > > Plane 6 Signal
> > > Signal 7 Plane Gnd
> > > Signal 8 Plane Vdd2
> > > Plane 9 Signal
> > > Plane 10 Signal
> > > Signal 11 Plane Vdd3
> > > Plane 12 Plane Gnd
> > > Signal 13 Signal
> > > Bottom 14 Bottom
> > >
> > > With regards,
> > > Nitin
> > >
> > >
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