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| From [log in to unmask] Wed Dec 4 17: |
05:37 1996 |
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hi,
one of my customers have built a 4 layers board as follows:
____________________________18 MIC COOPER (1/2 oz)
========================
======================== 3 X 7628
========================
---------vcc-------35 mic cooper (1 oz)
0.711mm CORE
----------gnd-------35 mic cooper
SAME AS ABOVE
with multifunctional resin type materials, it's tg is 140 c.
the end-user of this board have not specified any controlled impedance
tracks , BUT some signals do carry 0.7 giga to up to 4 giga !!!
could someone advise what is the dk of the epoxy at those rates,
should other materials be used then std. epoxy resins (fr4 -gfn)
any comment would be appreciated.
Yisrael Leshman
Octava Marketing
zichron-yaakov
ISRAEL
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