Differential Impedance error
- From: sjones@xxxxxxxxxxxxx
- Date: 27 Apr 2006 09:20:29 -0700
My ethernet 10/100 physical (KS8721) chip tracks to the RJ45 integrated
magnetics connector should have had a differential impedance of 100
ohms according to the manufactures spec, ( 5 thou tracks and 5 thou
gap). However the board was laid with 10 thou tracks 5 thou gap giving
70 ohms differential impedance (ground plane 5 thou below). The tracks
are about 25mm long and the board seems to work ok but I am about to do
a few changes and wondered if its worth changing, 5 thou tracks are
very thin and I have noted that the manufacturers development board
also uses 10 thou tracks.
.
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