[SI-LIST] Re: AW: Re: Impedance Controlled Board Production Vs Normal Board Production
- From: Cristian Gozzi <cristian.gozzi@xxxxxxxxx>
- To: Jayasuryan KG <suryan_tvm@xxxxxxxxxxx>
- Date: Thu, 5 Jan 2012 17:31:06 +0100
Usually is +/- 10%, so for 50Ohm you should get 45Ohm or 55Ohm
sometimes for differential impedance you can ask to get +/-5% for 100ohm
diff. controlled impedance (95ohm or 105ohm)
regards
Cris
SI & PI Specialist
Technoprobe Spa
2012/1/5 Jayasuryan KG <suryan_tvm@xxxxxxxxxxx>
> 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
>
>
> ----------------------------------------
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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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