[SI-LIST] Re: Random Jitter Value varies with Data pattern
- From: "Moreira, Jose-Antonio" <Jose.Moreira@xxxxxxxxxxxxx>
- To: "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
- Date: Mon, 28 Jan 2013 15:28:54 +0000
Hi vinod,
I see that you have a complete fait on the jitter separation SW on the
oscilloscope you are using but unfortunatelly no SW is perfect.
Why would you not assume that this is not a SW jitter separation problem? Just
because it is not the double dirac method it does not mean the algorithm you
are using is perfect.
Even some good algorithms might have troubles in certain situations. Also the
number measured points you are using for the jitter separation can have an
influence.
Save the 2 waveforms and send an email to your oscilloscope support and ask
them that question. Why RJ changed?
Jose
On Jan 28, 2013, at 1:29 AM, "vinod ah" <ah.vinod@xxxxxxxxx> wrote:
> DUT itself is signal generator which generates either PRBS pattern or
> clock pattern based on certain register settings. The DUT is connected
> to an oscilloscope where a jitter decomposition software runs.
> On Mon, Jan 28, 2013 at 2:15 PM, steve weir <weirsi@xxxxxxxxxx> wrote:
>
>> Truly random jitter is independent of the data pattern. Do you see
>> this jitter going straight from a pattern generator into a signal
>> analyzer, or only when your DUT is in the path?
>>
>> Steve
>>
>> On 1/27/2013 10:57 PM, vinod ah wrote:
>>> Hi All,
>>> On a 5Gb/s USB3 serial link, i see that there is variation in Random
>> jitter
>>> value when i use CP0 pattern (PRBS 11 pattern) when compared to CP1
>> pattern
>>> (Clock pattern 2.5GHz).
>>>
>>> I also see a variation in deterministic jitter, but that is more
>>> understandable as ISI effects are dominant with PRBS pattern and it
>>> is pretty much constant with clock pattern.
>>>
>>> Is Random jitter varying with data pattern is expected?. The
>>> difference
>> in
>>> readings is 2ps (Rj with PRBS is 5ps mean, while Rj with clock
>>> pattern is 3ps mean)
>>>
>>> Note: The measurements are not dual-dirac model based measurements.
>>>
>>> Regards
>>> Vinod A H
>>>
>>>
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>>
>> --
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