RE: [IBIS-Users] Issue with LVPECL output

From: Tom Dagostino <tom@teraspeed.com>
Date: Thu May 29 2014 - 10:17:27 PDT
The schematic was not included in the posting.  But looking at the waveforms I’ll take a stab at this issue.  What is your termination on the output?  Is it a 50 Ohm resistor from each output to Vcc – 2V or is it a 100 Ohm resistor tied between the two outputs?  The former should work, the latter will not work if this is a true ECL output.

 

Tom Dagostino

 

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From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On Behalf Of Girija V Chougala
Sent: Thursday, May 29, 2014 5:25 AM
To: ibis-users@eda.org
Cc: ibis-info@eda.org
Subject: [IBIS-Users] Issue with LVPECL output

 

Hi All,

I have tried using 5p49v5901 (versaClock@5 ) IBIS model. I'm trying to 
observe LVPECL outputs with proper termination. Hyperlynx tool is used for 
simulation. Snapshot of the schematic and simulation output are attached. 

 

The LVPECL output is not at all differential output. VOH , VOL are secondary 
concern.

Could anybody suggest what is wrong here.  

 

A quick reply would be highly appreciated.

 

Thanks,

Girija

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Received on Thu May 29 10:19:41 2014

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