[SI-LIST] : RE: 2.5GHz Materials

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From: Moran, Brian P (brian.p.moran@intel.com)
Date: Tue Apr 03 2001 - 09:29:03 PDT


Sreejith,

My preference is to go to a high frequency FR-4 material like GETEK or Nelco
4013 for 1Ghz plus boards, these materials are only slightly more expensive
and provide lower loss tangent and somewhat lower Er. Most vendors can use
them interchangably with FR-4. Depending on how long your interconnects are
and how many harmoinics you need to preserve this might be a cost effective
solution. If this is not acceptable then I would consult with a good high
end board or laminate vendor. Materials like cynate ester, and Gore
speedboard prepreg might be considered. I'm sure there are other new
materials and strategies I am not aware of. I have always been able to
survive with the high frequency FR-4s.

Brian P. Moran
Signal Integrity Engineering
Desktop Products Group, Intel Corp.
Mail-Stop: FM6-45
1900 Priare City Rd, Folsom CA 95630
Email: brian.p.moran@intel.com
Phone:(916) 356-1912

-----Original Message-----
From: Sreejith Varma [mailto:varma@blr.paxonet.com]
Sent: Tuesday, April 03, 2001 2:08 AM
To: Si List
Subject:

HI All,

i am doing a 2.5Ghz PCB design. i was wondering whether FR4 material
is sufficient for such high speed signals? or i should look at some
other material for these desings? and if FR4 is sufficient is there any
special care i have to take (other than impedance matching and differential
routings)

thanks in advance,
Sreejith
Paxonet Comm. (I) Ltd.
Blore, India

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