Thank you
Charles Grasso
Advisory Engineer
StorageTek
1 StorageTek Drive
Louisville CO 80027 M/S 4247.
Tel:303-673-2908
Fax:303-661-7115
email:[email protected]
RMCEMC Web Site: http://www.ewh.ieee.org/r5/denver/rockymountainemc/
-----Original Message-----
From: Allen Wang [mailto:[email protected]]
Sent: Friday, August 27, 1999 11:17 AM
To: [email protected]
Subject: [SI-LIST] : PCB impedance variation v.s. layout pattern
Dear all:
We are designing a Rambus related product which requires the PCB to
maintain
28 Ohm +/- 10% trace impedance.
However, what we have found that a straight line trace will get a higher
impedance (through TDR, 1 Ohm or more) than
a trace with many turns on it. We know a turn on the trace will change
the
impedance. However, is it the root cause
that make our trace impedance not consistent?
Two traces are on the same layer, with the same trace width.
+---------------------------------------------------------------------------
------------------------------------+
Straight line
+-----------+ +------+ +---- \\\\ -----+
+------------------------+
| | | | | |
| | | | | |
+-----+ +----+ +---+
line with turns
Allen
**** To unsubscribe from si-list: send e-mail to
[email protected]. In the BODY of message put: UNSUBSCRIBE
si-list, for more help, put HELP. si-list archives are accessible at
http://www.qsl.net/wb6tpu/si-list ****
**** To unsubscribe from si-list: send e-mail to [email protected]. In the BODY of message put: UNSUBSCRIBE si-list, for more help, put HELP. si-list archives are accessible at http://www.qsl.net/wb6tpu/si-list ****