[SI-LIST] Re: AC series capacitor position in high speed differentialsignals
- From: "Lee Ritchey" <leeritchey@xxxxxxxxxxxxx>
- To: "Steve Weir" <weirsi@xxxxxxxxxx>, "V S" <for_si2003@xxxxxxxxx>
- Date: Thu, 13 May 2010 09:17:28 -0700
Couldn't agree more. Look at almost any applications note for examples of
this.
Lee
> [Original Message]
> From: steve weir <weirsi@xxxxxxxxxx>
> To: V S <for_si2003@xxxxxxxxx>
> Cc: <si-list@xxxxxxxxxxxxx>
> Date: 5/13/2010 6:29:27 AM
> Subject: [SI-LIST] Re: AC series capacitor position in high speed
differentialsignals
>
> One of the problems with the WWW is that there is lots of information
> out there to be had for free. Unfortunately, a lot of it is only
> conditionally true, or just plain wrong. That blog article is a good
> example of the latter. Just because somebody writes something doesn't
> make it true.
>
> Steve.
> V S wrote:
> > I will hope that this article will help
> >
> >
http://referencedesigner.com/blog/ac-cap-placement-on-lvds-and-differential-
signals/609/
> >
> >
> > --- On Wed, 5/12/10, Istvan Novak <istvan.novak@xxxxxxx> wrote:
> >
> >
> >> From: Istvan Novak <istvan.novak@xxxxxxx>
> >> Subject: [SI-LIST] Re: AC series capacitor position in high speed
differential signals
> >> To: "Lee Ritchey" <leeritchey@xxxxxxxxxxxxx>
> >> Cc: "fei xue" <harrison_cls@xxxxxxxxxxxx>, si-list@xxxxxxxxxxxxx
> >> Date: Wednesday, May 12, 2010, 10:55 PM
> >> Lee,
> >>
> >> As it was pointed out in earlier threads, location does
> >> make a
> >> difference unless reflections are
> >> negligibly small. Assuming linearity, when we move
> >> components around,
> >> reciprocity prevails,
> >> but voltage transfer function from source to load will
> >> change, which in
> >> turn impacts eye
> >> parameters.
> >>
> >> Regards,
> >>
> >> Istvan Novak
> >> Oracle-America
> >>
> >>
> >> Lee Ritchey wrote:
> >>
> >>> This has been answered before on this forum.
> >>>
> >> Since the circuits are
> >>
> >>> linear, it does not matter from a signal integrity
> >>>
> >> point of view.
> >>
> >>> Lee
> >>>
> >>>
> >>>
> >>>
> >>>> [Original Message]
> >>>> From: fei xue <harrison_cls@xxxxxxxxxxxx>
> >>>> To: <si-list@xxxxxxxxxxxxx>
> >>>> Date: 5/12/2010 11:35:49 AM
> >>>> Subject: [SI-LIST] AC series capacitor position in
> >>>>
> >> high speed
> >>
> >>>>
> >>>>
> >>> differential signals
> >>>
> >>>
> >>>> Hello all,
> >>>> We often can get different guideline of placing
> >>>>
> >> capacitor position when
> >>
> >>>>
> >>>>
> >>> placing AC series capacitor on high speed differential
> >>>
> >> signals, like PCIe,
> >>
> >>> SAS or LVDS signals. sometimes we followed the
> >>>
> >> guideline to put capacitors
> >>
> >>> near driver, sometimes near multi-connection
> >>>
> >> connectors or sometimes put it
> >>
> >>> near receivers.
> >>>
> >>>
> >>>> Could anybody tell me what is the consideration of
> >>>>
> >> capacitor placing
> >>
> >>>>
> >>>>
> >>> position? Thanks!
> >>>
> >>>
> >>>> Harrison
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
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> >>
> >>
> >
> >
> >
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>
> --
> Steve Weir
> IPBLOX, LLC
> 150 N. Center St. #211
> Reno, NV 89501
> www.ipblox.com
>
> (775) 299-4236 Business
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- » [SI-LIST] Re: AC series capacitor position in high speed differentialsignals - Lee Ritchey
