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Jee Measurement

i want to better understand how the jee parameter is obtained.

I send a 50Mhz clock through a buffer, I set a pss simulation with a beat frequency of 50Mhz and a pnoise from 10kHz to 25Mhz with sampled noise, using as timing event trigger when the output of the buffer goes to 0 ( rise edge)

Looking at some documentation i see the jitter should be calculated as

So i extract the slope from the pss transient, then i took the average of the Sn(f) ,looking at the average of Output Noise( multiplied by the 25Mhz-10kHz) and try to calculate the jee using the formula.

But i does not obtain the same result as the Jee using this procedure.

What i'm doing wrong? Is Sn(f) the Output Noise from the Direct Plot form?

Thanks in advance

Parents

ShawnLogan over 2 years ago

Dear mxm14,

mxm14 said:
What i'm doing wrong? Is Sn(f) the Output Noise from the Direct Plot form?

I have tried to clarify the relationship between Jee and the sampled phase voltage error with a couple of examples. I also have reviewed the relevanr Cadence RAK document at URL:

https://support.cadence.com/apex/ArticleAttachmentPortal?id=a1O0V000009EVE2UAO&pageName=ArticleContent

and provided a number of potential corrections to hopefully prevent confusions for others studying this topic. I have placed the note at URL:

www.dropbox.com/s/3m531dl4fl7bwbr/jee_computation_example_sml_032823v1p0.pdf?dl=0

and include its summary on page 76 below as Figure 1.

I hope it makes some sense and provides some insight!

Shawn

Figure 1

from page 76 of www.dropbox.com/s/3m531dl4fl7bwbr/jee_computation_example_sml_032823v1p0.pdf?dl=0
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Tawna over 2 years ago in reply to ShawnLogan

Hi Shawn,

Please go to the Article https://support.cadence.com/apex/ArticleAttachmentPortal?id=a1O0V000009EVE2UAO&pageName=ArticleContent , click on the Feedback button on the right side, and enter your comments. This is the best mechanism to get an Article/AppNote/RAK updated.

best regards,

Tawna
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ShawnLogan over 2 years ago in reply to Tawna

Hi Tawna,

Thank you for your note and it is always very good to hear from you Tawna!!

Tawna said:
This is the best mechanism to get an Article/AppNote/RAK updated.

Well, I actually did add a note in the "Feedback" tab on the page you suggested on the same day I added the post to this Forum thread. I've used the "Feedback" mechanism before and usually hear pretty quickly from someone at Cadence regarding the feedback.

However, and I'm not piling any more work nor making a request for you, my current Cadence account does not provide access to articles in on-line support. To access those articles, I am using my prior account (which apparently has not been terminated by Cadence yet). Hence, when I submitted the feedback, I suggested that if anyone needed to contact me they use the email address I included in the feedback in lieu of the email address associated with my former Cadence account (it no longer exists). I have not heard from anyone at Cadence yet, so I suspect the comment may not be considered as the Cadence application team may find the mail address associated with the account submitting the feedback no longer exists. Hence, as I thought anyone with an interest in the topic might get some insight from the analyses, I also alerted those reading this Forum thread.

Shawn
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ShawnLogan over 2 years ago in reply to Tawna

Hi Tawna,

Thank you for your note and it is always very good to hear from you Tawna!!

Tawna said:
This is the best mechanism to get an Article/AppNote/RAK updated.

Well, I actually did add a note in the "Feedback" tab on the page you suggested on the same day I added the post to this Forum thread. I've used the "Feedback" mechanism before and usually hear pretty quickly from someone at Cadence regarding the feedback.

However, and I'm not piling any more work nor making a request for you, my current Cadence account does not provide access to articles in on-line support. To access those articles, I am using my prior account (which apparently has not been terminated by Cadence yet). Hence, when I submitted the feedback, I suggested that if anyone needed to contact me they use the email address I included in the feedback in lieu of the email address associated with my former Cadence account (it no longer exists). I have not heard from anyone at Cadence yet, so I suspect the comment may not be considered as the Cadence application team may find the mail address associated with the account submitting the feedback no longer exists. Hence, as I thought anyone with an interest in the topic might get some insight from the analyses, I also alerted those reading this Forum thread.

Shawn
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Tawna over 2 years ago in reply to ShawnLogan

Hi Shawn,

I clicked the feedback button for you and submitted your info. I won't be working on this, as I didn't develop this RAK (so you're not piling more work on me...this time. <grin>.) I sent your comments/paper to the RAK author. Feel free to email me your new email address and I'll pass it along to the RAK author.

Good to hear from you, as always, Shawn!

best regards,

Tawna
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