What you are proposing is a phase noise measurement. You can convert it to a
random jitter values but there are several caveats.
1) You still need to remove all periodic jitter components from your spectrum
measurement to get the phase noise.
2) You will always need to define a frequency integration range on your phase
noise measurement. An oscilloscope uses all its available bandwidth. This will
be a correlation problem with oscilloscope based measurements.
The measurement is completely valid but expect correlation issues if someone
later does a measurement of the same device on an oscilloscope with a high
enough frequency and some jitter separation SW. It is not that the random
jitter from the phase noise measurement is wrong, you just need to make sure
you compare apples to apples when comparing values.
I use a lot of times a phase noise measurement like you describe to specify
random jitter (with a specified integration range). The reason is that it is
easy for the end customer to make the same measurement on his own and
correlate, while using an oscilloscope it might be more complicated since
between oscilloscope vendors and SW you can get differences on the jitter
separation depending on the situation and especially for very low random jitter
values.
Jose
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On ;
Behalf Of Tesla
Sent: Thursday, February 18, 2016 10:19 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Measure RMS jitter of Serdes using spectrum analyzer
Hi Experts
I am curious about a idea using spectrum analyzer to measure the RMS jitter of
serdes. Because we do not have a high enough bandwidth scope.
For low frequency clock, we can use spectrum method to measure the RMS jitter
of clock source. Suppose we let the Serdes is outputing 101010.... clock
pattern. Can the RMS jitter be measured using spectrum analyzer like low
frequency clock?
Thanks a lot for your advice.
Tesla------------------------------------------------------------------
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