[SI-LIST] Re: PWj in PCIe Base Spec

  • From: Iliya Zamek <i_zamek@xxxxxxxxx>
  • To: "ah.vinod@xxxxxxxxx" <ah.vinod@xxxxxxxxx>, SI-LIST <si-list@xxxxxxxxxxxxx>
  • Date: Mon, 15 Jul 2013 12:20:35 -0700 (PDT)

Hi Vinod,  
There is a relationship between PWj and Tj. PWj spectrum Sp(f) is Tj spectrum 
St(f) multiplied by sin function in power 2: 
Sp(f)= St(f) x [2Sin(pi W f)]^2, where W is a pulse width.  
The relationships between different Jitter Terms were introduced in 2003 at 
IEEE Frequency Control Symposium. You might want to see these relationships in 
next publications:
I. Zamek, et. al, “Crystal oscillators` Jitter Measurements and its 
estimation of phase noise”, 
I. Zamek, et. al, “ DEFINITIONS OF JITTER MEASUREMENT TERMS AND 
RELATIONSHIPS,IEEE International Test Conference, 2005 
I. Zamek, “Jitter Spectral Theory”, DesignCon, 2006
 
 
In spite PWj might be calculated, at practice the amplitude noise always 
contributes to the Jitter measurements and whole picture become more complex 
becouse noise impacts various Jitter Terms differently. For example, noise 
impact on PWj is significantly stronger compared to its impact on Tj 
measurements. That is why it has sense to measure PWj, as soon as it is in the 
specification.
Regards, 
Iliya
 

________________________________
 From: vinod ah <ah.vinod@xxxxxxxxx>
To: SI-LIST <si-list@xxxxxxxxxxxxx> 
Sent: Friday, July 12, 2013 11:24 PM
Subject: [SI-LIST] PWj in PCIe Base Spec
  

Hi all,

I have one basic query on pulse width jitter (PWj) and its importance
in PCIe base spec.

When we post process the PCIE3 waveform using SIGTEST, we see that PWJ
is calculated and it has spec to pass as defined by PCIe base spec.

So was wondering, why is there a test for PWJ provided we pass the eye
height, eye width, Rj Dj jitter tests? In fact PWj is a form of Dj.
Assuming that Tj is met for BER we are looking for, is there a real
need for PWJ to pass the spec?

Also Is there any relation or equation between Tj & PWj or PWj & Dj?

Regards
Vinod A H
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