[SI-LIST] Crystal Clock Random Jitter
- From: vinod ah <ah.vinod@xxxxxxxxx>
- To: SI-LIST <si-list@xxxxxxxxxxxxx>
- Date: Wed, 9 Jan 2013 16:09:39 +0530
Hi all,
I am measuring a Random jitter of parallel resonant crystal clock on a
tablet board. I plotted histogram and found it to be in bell shape
i.e. Gaussian distribution.
But when i add a series resistor to reduce the drive current to crystal, i
find that the histogram shape changes to bi-modal i.e. the one which we get
when we have both Random jitter and Deterministic jitter.
I am unable to understand the crystal clock jitter behavior after adding
drive control resistor. I dont see any changes in waveform shape when i
measure it in oscilloscope, neither the crystal is having any trouble in
starting up.
Regards
Vinod A H
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