[SI-LIST] Re: Question about emphasis taps
- From: "T.K. Jeon" <tkjeon@xxxxxxxxxxx>
- To: "yfu@xxxxxxxxx" <yfu@xxxxxxxxx>, "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
- Date: Fri, 6 Dec 2013 18:28:29 -0800
Hi Johnny,
One way is to do IFFT for the insertion loss and get the pulse response. Once
you get cursors in the time domain, you can build its matrix depending on how
many taps you implemented and use a simple algorithm like Gaussian elimination
in order to get the solutions for variables, which in this case are the tap
values for the emphasis settings.
TK
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of FU, Yejun
Sent: Monday, December 02, 2013 1:31 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Question about emphasis taps
Hi all:
I am currently working on a high speed differential trace
characterization up to 28Gbps, the problem is the high insertion loss, your
signals has degraded just for several inches. So this company comes up with
this tools to calculate the emphasis taps you can add into your PG to
compensate the loss and reopen the eye. I was so confused by the way how they
calculate it, because sometime they won't give you the best optimized taps.
Any suggestion to full understand the Pre-emphasis Vs. insertion loss?
Thanks
Yejun(Johnny) Fu|
yfu@xxxxxxxxx | 3500 Carling Ave.| Ottawa, ON, K2H 8E9, CAN Direct
+1.613.670.3283
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