[SI-LIST] Re: How to reduce the impedance?
- From: "Beal, Weston" <weston_beal@xxxxxxxxxxx>
- To: "'Fu.Gerg@xxxxxxxxxxxx'" <Fu.Gerg@xxxxxxxxxxxx>,"Si-List (E-mail" <si-list@xxxxxxxxxxxxx>
- Date: Fri, 12 Dec 2003 11:42:10 -0800
Greg,
based on just the information you've given, you would need to make the traces
about 70 mil wide in order to make them 55 Ohms. This is probably impractical
for your application, so you should investigate the suggestion from Istvan to
route ground traces next to your signal traces on the same layer.
Regards,
Weston
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]On
Behalf Of Fu.Gerg@xxxxxxxxxxxx
Sent: Thursday, December 11, 2003 7:54 PM
To: Si-List (E-mail
Subject: [SI-LIST] How to reduce the impedance?
Sensitivity: Personal
Hi all,
Recently we design a two layer board. It's designed as an =
additional daughtercard to mothercard.
Its total height is 1.2mm.Top layer is signal, bottom layer is =
Ground. Every layer is filled with 1OZ Cu. When we set the trace width =
10mil,then the trace impedance is so high(almost 120Ohm), it can't match =
with mothercard's trace impedance(55Ohm).
Then keeping the daughtercard's total height, any way to lower the =
impedance of daughtercard trace(if trace width is too big, no meaning in =
practice). Any help will be greatly appreciated.
Best regards,
Greg
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