[SI-LIST] : receiver jitter

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From: Chris Cheng (hycheng@3pardata.com)
Date: Mon Jan 17 2000 - 16:51:26 PST


as core and signal swing getting smaller and smaller, this
problem is getting worst. compound this with source sync
buses where the strobes and data can behave differently
(true differential vs. pseudo differential), i believe
predicting the response of the receiver under different
waveforms input will be as important as simulating
the propagation of signal in the interconnect
environment. this will be the final nail in the coffin for
behavioral models like ibis which is totally incapable of
handling such analysis. i have seen pitiful attempts to
qualitatively describe it in ring back or edge rate
extrapolation but without the ability to simulate the
receiver behavior, those specs are just fancy words with
no meaningful insight into the response of the true
receiver.
can i spell SPICE again.
chris

-----Original Message-----
From: owner-si-list@silab.eng.sun.com
[mailto:owner-si-list@silab.eng.sun.com]On Behalf Of
Raymond.Leung@qsa.idt.com
Sent: Monday, January 17, 2000 2:57 PM
To: si-list@silab.eng.sun.com
Subject: Re: [SI-LIST] : High Speed Backplane Connector Recommendations

Bruce,

It is not long ago, sometime before last Chrstimas to early this year.
I remember I read a couple of D.C.'s messages about the jitter discussion
after my holiday. Unfortunately I cannot remember the subject titles.

As what I can recall, he has said something about the jitter generated by
the change of the gain at different common mode levels. My case would
be different because jitter was caused by the degradation of CMRR
at high frequency. My apology D.C. if my memory betrays me.

Regards,
Raymond
---------------------- Forwarded by Raymond Leung/QSA/AU on 18/01/2000 08:33
---------------------------

"Bruce W. Marler" <BMarler@WooshCom.com> on 18/01/2000 01:45:56

Please respond to si-list@silab.eng.sun.com

To: si-list@silab.eng.sun.com
cc: (bcc: Raymond Leung/QSA/AU)

Subject: Re: [SI-LIST] : High Speed Backplane Connector Recommendations

Raymond,
Do you know the subject wording on the thread on this forum where "D.C.
complained
about the output signal edge jitter caused by the wide common mode variation
at the differential inputs."?

I would like to go back and read that thread.
Bruce

----- Original Message -----
From: <Raymond.Leung@qsa.idt.com>
To: <si-list@silab.eng.sun.com>
Sent: Sunday, January 16, 2000 5:21 PM
Subject: Re: [SI-LIST] : High Speed Backplane Connector Recommendations

> While I have no comment about the coplannar waveguide as
> well as the orginal connector discussions, I would like to say
> something about the LVDS receiver. As mentioned before, the
> CMRR can never be ideal in high freq. D.C. has already complained
> in this forum about the output signal edge jitter caused by the wide
> common mode variation at the differential inputs, and I have a
> similar headache. Supressing the high freq. ac common mode
> is definitely a merit for reliable data recovery.
>
> Regards,
> Raymond
>
>

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