[SI-LIST] Re: PCI Express AC coupled signals
- From: "tao xu" <helen.tao.xu@xxxxxxxxx>
- To: ivorlist@xxxxxxxxxxx
- Date: Thu, 15 Nov 2007 09:22:02 +0800
Hi, Ivor
The placement position of capacitor will effect a little bit about jitter of
channel. You can use a simulation tool to investigate relationship
jitter/postion of capacitor. Of cource, you can put cap on receiver side if
you have enough timing margin. But if your timing is tight. a simulation to
find best postion for AC cap is recommended.
thanks and regards
Tao (helen )
On Nov 15, 2007 5:47 AM, Ivor Bowden <ivorlist@xxxxxxxxxxx> wrote:
> Thanks to all who replied :-)
> All replies confirm this should be OK, I expected as much, but it is
> good to have consensus!
> Ivor
>
>
> on 11/14/2007 7:43 AM PDT Ivor Bowden wrote:
> > Any reason why not to locate the PCI Express coupling caps at the
> > receiver on a system board implementation? I know PCI Express Base
> > Specification section 4.3.1.2 calls out "The requirement for the
> > inclusion of AC coupling capacitors on the interconnect media is
> > specified at the Transmitter", but there are no specific placement rules
> > except the specifications for separate host / card module require that
> > physical division. Based on the recent "AC Coupled Signals" thread, it
> > would seem reasonable to place the capacitors at the receiver on a
> > system board, allowing the advantage that the mounting pads could be
> > used for probing - eliminating the necessity of separate test points at
> > the RX end.
> > Thanks,
> > Ivor Bowden
> > Hardware Engineer
> > Curtiss-Wright Controls Embedded Computing
> >
>
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