[SI-LIST] [SI-List]: Rj addition for across bandwidths
- From: vinod ah <ah.vinod@xxxxxxxxx>
- To: SI-LIST <si-list@xxxxxxxxxxxxx>
- Date: Thu, 30 Jan 2014 16:21:21 +0530
Hi,
I am doing stressed eye calibration for PCIe2 Rx Jitter tolerance test.
We need to calibrate Rj at 2 different bandwidths i.e. from 10KHz to 1.5MHz
and 1.5MHz to 10MHz as per CEM spec.
For 10KHz to 1.5MHz , Rj is set to 3ps rms while 1.5MHz to 10MHz Rj is set
to 1.4ps rms. I am also adding Dj of 57 ps.
So out of 200 ps (5Gbps), jitter at BER 10^-12 is 3.31*14.06 + 57 =
103.5ps.
3.3ps rms for Rj is based on rms of 3ps and 1.4ps.
But i see that measured jitter is 85ps (85ps corresponds to 2ps rms Rj with
Dj being 57ps and BER is 10^-12).
Note that i am not using any clock recovery circuit to measure Rj in BERT
as clock recovery units will track out the jitter.
So i am feeling that my total Rj calculation has some issues. Can please
help me understand Rj addition across bandwidths.
Regards
Vinod A H
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