[SI-LIST] Re: VIA stubs
- From: steve weir <weirsi@xxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Mon, 20 Aug 2012 08:14:43 -0700
A structure that is less than lambda / 10 and that only occurs a few
times in a design is not likely to cause any serious issues for a
digital signal.
Steve
On 8/20/2012 7:57 AM, Knut Gabrielsen (kngabrie) wrote:
> Hello Experts!
> I am involved in a design where we need to transfer ~6Gbit/s diff-signals
> between a processor and an FPGA. If I route these signals as striplines
> inside the PCB, there will be a stub on the (through-hole) VIA, stub-length
> ~1100um = 43mil.
>
> My question to you all: Should I be concerned? At what frequencies will a VIA
> stub seriously affect SI?
>
> And - will the signal see the stub itself, or just "experience" the VIA as a
> stray capacitance on the transmission line?
>
> Rgds,
> Knut
>
>
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