[SI-LIST] Re: AC coupling capacitors (SATA, PCIe)

  • From: Hermann Ruckerbauer <Hermann.Ruckerbauer@xxxxxxxxxxxxx>
  • To: si-list@xxxxxxxxxxxxx
  • Date: Mon, 17 Sep 2012 22:20:10 +0200

Hello Rohit,

thanks for the answer, and sorry for my bad description.

I hope to clarify what I ment:
 Any kind of Capacitor that is specially designed for AC-Coupling
(DC-Blocking) for a specific application (PCIe, SATA, ...) e.g. :
- low ESR/ESL caps / high Q caps / controlled ESR caps
- Special material
- size other than 0402 (e. g. 0201 or reverse geometry)
- Special designed to have the impdeance minimum fitting to the
application (I have no idea how to fit 10MHz from plot in the link below
to e.g. 3GHz of a SATA interface).
- ... ????

I found a lot of documents dealing with Capacitors for PDN, but not too
much for Capacitors used as AC-coupling in serial link applications.
e. g.     www.murata.com/products/article/pdf/ta1082.pdf

Currently I can optimize my board e. g. in order to avoid the
Capacitance of the pads, but I have somehow no idea whether I can use
some optimized capacitors as AC-Coupling of a SATA or PCIe interface ..

Any feedback welcome ..

Hermann



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Am 13.09.2012 12:38, schrieb Rohit MISHRA:
> Hello Hermann,
>
> I don't know what do you mean by "special AC coupling capacitors" but there 
> was a paper from Yaochao Yang & his team in DesignCon 2012, Titled " Embedded 
> DC Blocking Capacitors in Connectors - Study of Impacts on PCB Design"
>
> You can have a look, May be you can find what you are looking for.
>
> Rgds,
> Rohit
>
>
>
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On 
> Behalf Of Hermann Ruckerbauer
> Sent: Thursday, September 13, 2012 2:34 PM
> Cc: SI LIST
> Subject: [SI-LIST] AC coupling capacitors (SATA, PCIe)
>
> Hi,
>
> i have done a short search on special AC coupling capacitors for serial
> interfaces  (PCIe, SATA, .. ) , but found nothing really special.
> I have found Steves DesignCon 2012 presentation, but this deals more
> with characterization than performance requirements.
>
> Is there something better available, than a standard C0G/X7R  capacitors ?
>
> Thanks for any feedback ..
>
> Hermann
>
> Our next Events:
> ================
>
> "Open the Black Box of Memory"
> Seminar on 08/09. November 2012
>
> Check our website or contact us for details
>
> EKH - EyeKnowHow
> Hermann Ruckerbauer
> www.EyeKnowHow.de
> Hermann.Ruckerbauer@xxxxxxxxxxxxx
> Veilchenstrasse 1
> 94554 Moos
> Tel.: +49 (0)9938 / 902 083
> Mobile:       +49 (0)176  / 787 787 77
> Fax:  +49 (0)3212 / 121 9008
>
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