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September 2005

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Subject:
Re: <List>[TN] 5% trace width control_RF
From:
Steve Hodge <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Steve Hodge <[log in to unmask]>
Date:
Tue, 6 Sep 2005 06:11:28 -0600
Content-Type:
text/plain
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text/plain (38 lines) 
Your PCB maker needs to have more line width tolerance than +/-.00025. That
is not achievable or even vaguely realistic. What is the impedance tolerance?

At 12:30 AM 09/04/2005, you wrote:
>My customer told me that one of the RF pcb need to maintain the 5mils trace
>width within 5% tolerance in order to achive 50 ohms impedance.
>My pcb maker said they can only control at 20%(copper etching process
>capability) trace width tolerance BUT can guarantee that the impedance is
>at 50 ohms.
>Please comment.Should I take the words of pcb supplier?
>
>rgds
>sumxp
>
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