Thank you,Steve.
It is 5% tolerance.

rgds
sumxp
----- Original Message -----
From: "Steve Hodge" <[log in to unmask]>
To: "TechNet E-Mail Forum" <[log in to unmask]>; "sumxp" <[log in to unmask]>
Sent: Tuesday, September 06, 2005 8:11 PM
Subject: Re: <List>[TN] 5% trace width control_RF


> 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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