[SI-LIST] Re: RMS jitter
- From: Khalid Ansari <khalida@xxxxxxxxxxx>
- To: emiguel@xxxxxxxxxx,"Si-List@Freelists. Org" <si-list@xxxxxxxxxxxxx>
- Date: Thu, 13 Dec 2001 10:00:57 -0800
Thanks Ed and others for your responses. I have attached something
I put together for my group on this based on some experiments
and responses on the Si_List if anyone is interested in
commenting or adding to this or some lesser experienced guy
like myself trying to learn. Some of the data in the document
is from Maxim app. note HFAN-4.0.2.
Khalid
At 12:55 PM 12/12/01 -0600, Ed Miguel wrote:
>Khalid,
>
>I always considered the RMS value to be 1 sigma. When going from RMS to
>p-p I have used 6 sigma (+/- 3 sigma).
>You should be able to reverse this if you are coming from p-p to
>RMS. You can get a good sampling with as little as 500 - 1000
>cycles. We sometime look at the 3 sigma reading on the scope as it is
>taking its measurments and wait for it to register less than 100% (i.e.
>99.9%) and consider that enough for general measurements.
>
>For a BER measurement of 10 ^-12 you would need 14.069 sigma. That
>provides a p-p range that includes all of the samples minus 1 x 10^ -12
>times the number of samples. Such a BER would be typical for fiber channel
>communication. On the other hand a BER for 6 sigma will be 1.3 x 10^-3
>because less of the samples are included in the lower sigma.
>
>Ed
>
>
>
>
>
>
>At 02:28 PM 12/11/01 -0800, Khalid Ansari wrote:
>
> >Hi all,
> >
> >I am not very clear on what exactly is the RMS jitter value when using a
> >scope such
> >as the Tek11801. Also, the relation between RMS and pk-pk jitter
> >values. Looking
> >at the eye for X amount of time is it possible to get the RMS value from
> >the pk-pk value.
> >The oscilloscope basically generates the pk-pk value from the time
> >difference between
> >the furthest points on the histogram which varies with the number of
> >samples taken,
> >not a very sensible measurement I guess.
> >
> >I remember multiplying the RMS value by 14 (7 sigma) to get the pk-pk value
> >in the
> >past because we were using BER tolerance of 10exp-12...what this means, I
> >don't
> >exactly know.
> >
> >Any reference to documents on RMS jittter or any feedback will be very
> >helpful,
> >
> >Thanks in advance,
> >Khalid
> >
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