[SI-LIST] Re: How to analyze jitter of data
- From: "Tom Waschura" <tom_waschura@xxxxxxxxxxxxxxxxxxxxx>
- To: <zhang_kun@xxxxxxxxxx>, "'si-list'" <si-list@xxxxxxxxxxxxx>
- Date: Wed, 19 Jan 2005 01:42:21 -0800
As Rick suggested, there are other tools to analyze eye openings and various
types of jitter that may be preventing your system from communicating
properly. Analysis techniques include decomposing the measured probability
density function of the transitions of your data stream into portions that
are due to random or deterministic causes. This can be taken to many
extremes, but given that you are having a problem with a printed circuit
board, it may be as simple as the data dependent distortions due to the
lossy PCB traces.
Other companies, as well, have a lot of information to apply to your
problem. I know of great work at Agilent using their DCA-type scopes,
LeCroy using their deep memory capture ability as well as at our company,
SyntheSys Research, using our BERTScope instrument. There is also a lot of
information to be found at the various standards bodies having to do with
jitter effects of lossy cables or PCBs (including standards for Ethernet,
serial-ATA, PCI-express, fiber-channel, etc.).
Best Regards,
Tom Waschura,
SyntheSys Research, Inc.
www.synthesysresearch.com
tom_waschura@xxxxxxxxxxxxxxxxxxxxx
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Baze, Rick
Sent: Wednesday, January 19, 2005 12:21 AM
To: zhang_kun@xxxxxxxxxx; si-list
Subject: [SI-LIST] Re: How to analyze jitter of data
Go to www.wavecrest.com and check out their application notes and =
technical papers. Wavecrest is the jitter expert in electrical and =
optical applications.
Regards,
Rick Baze
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Zhangkun
Sent: Wednesday, January 19, 2005 1:06 AM
To: si-list
Subject: [SI-LIST] How to analyze jitter of data
Dear all:
Recently, I meet one problem about optic fiber. Two PCB could not =
correctly communicate. The measured result showed that the jtter of the =
optical signal is too large. Now I am measuring the spectrum electrical =
input of the optic module.
If the signal is clock-like, I could analyze the jitter by checking the =
sideband. Currently, the signal is of data. How to analyze the spectrum =
in order to find out what is the reason for jitter?
Best Regards
Zhangkun
2005.1.19
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