[SI-LIST] Re: effect of via stub
- From: steve weir <weirsi@xxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Tue, 19 Mar 2013 01:50:02 -0700
Limiting discontinuities to less than 1/20th bit cell is not a bad
starting place. As in all things SI/PI: "It depends." Do you have
lots of margin before this consideration or not?
Steve.
On 3/19/2013 1:35 AM, Balamanikandan K wrote:
> Hi,
>
> "In high-speed designs, a good rule of thumb to remember is that a via stub
> should be less than 300mils/BR in length; where BR is the bit rate in
> Gb/s." can be found at http://blog.lamsimenterprises.com/
>
>
>
> 1. Is this rule of thumb correct?
>
>
> 2. * **If it is correct*, for the data rate 3.125Gbps ,Thickness of the
> PCB= 62 mils and via stub length= 52.9 mils,
>
> Then via stub length = 52.9 mils < (300mils /3.125)
>
> < 96 mil
>
> In this case, is the effect of via stub less? Will the via stub cause any
> issue at 3.125Gbps?
>
>
--
Steve Weir
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