[SI-LIST] Er Variation
- From: Martyn Gaudion <martyn.gaudion@xxxxxxxxxxxxxxxxxxxx>
- To: aaron.helleman@xxxxxxxxxxx
- Date: Thu, 15 Nov 2001 22:44:07 +0000
Dear Aaron,
You may find you have more variation in
board fabricator process than you do due
to frequency. As impedance only varies as
1/sq root Er.
Fine line structures (differential and coplanar) can be affected by
local glass / resin ratio variation:
www.polarinstruments.com/support/cits/AP139.html
IPC 2141 has some tables on typical variation with frequency, but I am not sure
how new the data is.
You can graph this using the Si6000b field solver
from Polar, a free demo is available for surface
microstrip from www.polarinstruments.com
Hope the above information is of
some assistance.
Kind regards
Martyn Gaudion
www.polarinstruments.com
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