[SI-LIST] Re: Fw: About the spacing between GND pad and PCIE traces
- From: Jia Gongxian <jgxian@xxxxxxxxxx>
- To: pangning2000@xxxxxxxxx
- Date: Sat, 26 Jun 2004 14:35:58 +0800
Hi Peter,
Since the the pads between the differential pair is gnd pads, and the PCI
express signal is differential, these two pads will have little impact on
PCIE's SI.By the way,the conditions you mentioned for some kinds of connectors
such as HS3 is inevitable.
Jia Gongxian
----- Original Message -----
From: "Pang Ning" <pangning2000@xxxxxxxxx>
To: <si-list@xxxxxxxxxxxxx>
Sent: Saturday, June 26, 2004 12:37 PM
Subject: [SI-LIST] Fw: About the spacing between GND pad and PCIE traces
> Dear Experts,
>
> I have a question about the layout of PCI Express traces. We planned to use
> 5mil trace width and 6mil (or 7mil) air gap for each PCIE differential pair.
> But there are two GND pads that are located at the both sides of the
> differential pair (Each differential pair is sandwiched by two GND pads) .
> The spacing between GND pad and PCIE trace is only 5mil. As PCIE has very
> high swithing frequency, my concerns are if the two GND pads will impact PCIE
> signal quality. Is it possible that PCIE signal will be coupling to GND pads
> ? Thanks for you help.
>
> Best regards,
>
> Peter
>
>
>
>
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