So I am understanding correctly, this is for 10 layer stack up? Emory Moody Sr. Recruiter SourceRight Solutions (Partnering with Intel Corporation) Talent Acquisition Outsourcing MSP * RPO * Professional Contingent Workforce Services 925 North Point Pkwy, Suite 100 Alpharetta, GA 30005 Tel 336-674-9353 emorymoody@xxxxxxxxxxxxxxx -----Original Message----- From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of steve weir Sent: Thursday, May 13, 2010 3:35 PM To: Jaison Fernandez Cc: si-list@xxxxxxxxxxxxx Subject: [SI-LIST] Re: 10 Layer PCB Stack-up Jaison, your stack-up will have poor impedance control and substantial cross-talk between L1 and L2, and L9 and L10. It is also unbalanced which makes it susceptible to warpage. Depending on your power requirements, an alternate 10 layer would be: 1. S1 2. Gnd 3. S2 thick dielectric 4. S3 - low edge rate / frequency 5. Power dielectric 3-4 mils 6. Gnd 7. S4 thick dielectric to match L3/L4 8. S5 9. Gnd 10. S6. This gives you good impedance control, and Gnd referencing on S1, S2, S4, S5, and S6. The disadvantage is the long Z axis run to the power cavity which will require more bypass caps to compensate. That assumes that the Z axis inductance isn't so high that they can't. If the power distribution needs to be near the top for Z axis inductance, you will either need to come up with enough Cu on L1, and/or L3 to make that work, go to 12 layer construction, or lose signal layers. Steve. Jaison Fernandez wrote: > Dear All, > Currently I am working on a board which contains ATMEL AT91SAM9M10, 128MB > SDRAM (166MHz), GPS Chip solution, High current motor Drivers etc. > > I got a 10 Layer reference stack up from team my team as follows: > > 1. Top - Signal 1 (Low frequency) > ------------------------- > 2. Signal 2 (Low frequency) > ------------------------- > 3. GND 1(Plane) > ------------------------- > 4. Power 1 (Plane) > ------------------------- > 5. GND 2 (Plane) > ------------------------- > 6. Signal 3 (High Frequency) > ------------------------- > 7. Signal 4 (High Frequency) > ------------------------- > 8. GND 3 (Plane) > ------------------------- > 9. Signal 5 (Low frequency) > ------------------------- > 10. Bottom Signal 6 (Low frequency) > ------------------------- > > My major intention is to reduce the radiated emission so that my GPS Chip > solution using passive antenna should work with out any interference from > other sections of my board it's self. > > Also we need to pass the EMI/EMC tests. > > When I refer regarding layer stack up in internet what I can found is all > signal layers are followed by a immediate reference plane. > > Is my above layer stack up is ok for my requirements? > Experts suggest please... > > Regards, > Jaison Fernandez > > > > ------------------------------------------------------------------ > To unsubscribe from si-list: > si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field > > or to administer your membership from a web page, go to: > //www.freelists.org/webpage/si-list > > For help: > si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field > > > List technical documents are available at: > http://www.si-list.net > > List archives are viewable at: > //www.freelists.org/archives/si-list > > Old (prior to June 6, 2001) list archives are viewable at: > http://www.qsl.net/wb6tpu > > > > -- Steve Weir IPBLOX, LLC 150 N. Center St. #211 Reno, NV 89501 www.ipblox.com (775) 299-4236 Business (866) 675-4630 Toll-free (707) 780-1951 Fax ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List technical documents are available at: http://www.si-list.net List archives are viewable at: //www.freelists.org/archives/si-list Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List technical documents are available at: http://www.si-list.net List archives are viewable at: //www.freelists.org/archives/si-list Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu