[SI-LIST] AW: Re: Impedance Controlled Board Production Vs Normal Board Production
- From: "Havermann, Gert" <Gert.Havermann@xxxxxxxxxxx>
- To: "Rick Collins" <gnuarm.2006@xxxxxxxxx>, "Muhammad Nazir" <muhammad.nazir@xxxxxxxxx>, "steve weir" <weirsi@xxxxxxxxxx>
- Date: Wed, 4 Jan 2012 08:49:08 +0000
Hi Jayasuryan,
for PCB vendors "Impedance controlled" is a matter of knowledge and processing
tolerances.
For a regular PCB, the vendor will only guarantee tracewidth and copperweight
in a certain tolerance band. These factors are not anough to ensure proper
impedance.
For Impedance Controlled PCBs the vendor needs to understand his processes and
the materials he uses. He needs to adjust the tracewidth and/or stack to
guarantee proper impedance. Geometrically, the commonly used 10% Impedance
tolerance is exactly the 10% etching tolerance, thus impedance control doesn't
necessarily need more accurate etching, but the correct tracewidth isn't always
supplied by the PCB designer, thus the PCB vendor has to check and adjust.
BR
Gert
----------------------------------------
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-----Ursprüngliche Nachricht-----
Von: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] Im
Auftrag von Rick Collins
Gesendet: Dienstag, 3. Januar 2012 00:03
An: Muhammad Nazir; steve weir
Cc: si-list@xxxxxxxxxxxxx
Betreff: [SI-LIST] Re: Impedance Controlled Board Production Vs Normal Board
Production
He is saying that you need to get the PCB fabricator to guaranty the impedance
of the traces. Certainly that should work. If the PCB fabricator won't
guaranty the impedance, you need to understand why. I would think that they
don't have good control over their processes.
Rick
At 05:47 PM 1/2/2012, Muhammad Nazir wrote:
>Hi!
>I could not understand the response.
>Best regards.
>-MN
>On Mon, Jan 2, 2012 at 6:23 AM, steve weir <weirsi@xxxxxxxxxx> wrote:
>
> > Suppose as you like. Hope as you might. What you don't contract is
> > not guaranteed.
> >
> > Steve.
> > On 1/2/2012 5:56 AM, Jayasuryan KG wrote:
> > > Dear Experts,
> > >
> > >
> > >
> > > Happy New Year!!
> > >
> > >
> > >
> > > I have question regarding the impedance controlled board
> > > production! Is
> > there any special process to produce impedance controlled board
> > >
> > > rather than the normal production?
> > >
> > >
> > >
> > > Suppose if I go with normal production for a impedance controlled
> > > board
> > (the design has been done to meet the impedance) what are the
> > possible issues can happen?
> > >
> > >
> > >
> > > Looking for your immediate response. Thanks in advance.
> > >
> > >
> > >
> > > Best Regards,
> > >
> > > - Jayasuryan
> > >
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