[SI-LIST] Trace Width @ 3Gb/s

  • From: "Rudy Sterner" <rsterner@xxxxxxxx>
  • To: <si-list@xxxxxxxxxxxxx>
  • Date: Mon, 10 Jun 2002 08:14:26 -0700


   We have some issues with a SerDes which we think
may be related to the trace width on the serial line.  The
serial  port is a differential pair passing data at 3 Gb/s.
The trace width is 4 mils.  Length is approximately 5 inches.
The differential impedance is 100 Ohms.  Other information
which may be of use is the board material is FR-4 with an
Er of 3.9.  It is specified at this data rate.

  My question is:  Are the traces too narrow?  Should I
expect better performance with 8-mil traces?

Thank You

Rudy Sterner
LSI Logic

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