[SI-LIST] Re: AW: Re: Impedance Controlled Board Production Vs Normal Board Production
- From: Michael Greim <mgreim001@xxxxxxxxx>
- To: steve weir <weirsi@xxxxxxxxxx>
- Date: Thu, 5 Jan 2012 08:03:49 -0700
There is always a price variance with respect to tolerancing
because a tighter tolerance means more scrap or more tightly
controlled materials or process.
-Michael.
We will either find a way or make one - Hannibal
In the middle of every difficulty lies opportunity - Al Einstein
If you think you can do something or you think
you can't, in both cases you are probably right - H Ford
If you're not getting the results you want with the
current approach, move on and try something else. - A. Fleischmann
On Thu, Jan 5, 2012 at 6:58 AM, steve weir <weirsi@xxxxxxxxxx> wrote:
> The acceptable impedance match depends on the signaling methodology and
> topology.
>
> Steve.
> On 1/5/2012 4:24 AM, Jayasuryan KG wrote:
> > Dear All,
> >
> > Thanks for your valuable inputs.
> >
> > Suppose I am expecting a 50 Ohm Impedance Controlled Board from the
> > supplier,
> > what is the tolerance I can accept? Is it +-5% more, more than that?
> What is
> > the max tolerance we can accept?
> >
> > Is there any price variation w.r.t to the tolerance or just the
> capability
> > of the production house?
> >
> > Best Regards,
> > Jayasuryan
> >
> > -----Original Message-----
> > From: Havermann, Gert
> > Sent: Wednesday, January 04, 2012 2:19 PM
> > To: Rick Collins ; Muhammad Nazir ; steve weir
> > Cc: si-list@xxxxxxxxxxxxx
> > Subject: [SI-LIST] AW: Re: Impedance Controlled Board Production Vs
> Normal
> > Board Production
> >
> > 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
> >
> >
> > ----------------------------------------
> > Absender ist HARTING Electronics GmbH& Co. KG; Sitz der Gesellschaft:
> > Espelkamp; Registergericht: Bad Oeynhausen; Register-Nr.: HRA 5596;
> > persönlich haftende Gesellschafterin: HARTING Electronics Management
> GmbH;
> > Sitz der Komplementär-GmbH: Espelkamp; Registergericht der
> > Komplementär-GmbH: Bad Oeynhausen; Register-Nr. der Komplementär-GmbH:
> HRB
> > 8808; Geschäftsführer: Edgar-Peter Duening, Torsten Ratzmann, Dr.
> Alexander
> > Rost
> >
> > -----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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> Steve Weir
> IPBLOX, LLC
> 150 N. Center St. #211
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>
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