RE: [IBIS-Users] IV Curves

If you have a 3.3V step going from 3.3 to 0V and it hits an open
transmission line it will reflect back to -3.3V.

Tom Dagostino
Teraspeed Consulting Group LLC
503-430-1065
tom@teraspeed.com
www.teraspeed.com

-----Original Message-----
From: lee yang [mailto:changly_80@hotmail.com]
Sent: Sunday, January 09, 2005 11:11 PM
To: tom@teraspeed.com; ibis-users@eda.org
Subject: RE: [IBIS-Users] IV Curves

Hi Tom,

Thanks for your responce...
However, i couldn't get you clearly. If the transmission line is being
opened, the reflection coefficient is 1, how could it become -vcc?
Appreciate if you could explain it in more details.
Could someone please help with my 2 questions below?
Thanks and much appreciated.

-LY

>From: "Tom Dagostino" <tom@teraspeed.com>
>Reply-To: <tom@teraspeed.com>
>To: "lee yang" <changly_80@hotmail.com>, <ibis-users@eda.org>
>Subject: RE: [IBIS-Users] IV Curves
>Date: Sun, 9 Jan 2005 20:41:50 -0800
>
>Think about reflections off an open transmission line for your answer.
>
>Tom Dagostino
>Teraspeed Consulting Group LLC
>503-430-1065
>tom@teraspeed.com
>www.teraspeed.com
>
>-----Original Message-----
>From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org]On
>Behalf Of lee yang
>Sent: Sunday, January 09, 2005 5:58 PM
>To: ibis-users@eda.org
>Subject: [IBIS-Users] IV Curves
>
>
>Hi IBIS experts:
>
>I have a few questions regarding IBIS data:
>1) What is the reason of ground clamp and pulldown data is ground relative
>while power clamp and pullup data is vcc relative?
>2) The IV curves data is covered from -vcc to 2vcc, in what condition the
>voltage would become -vcc? (eg1: output is driving vcc and the receiver end
>is being shorted, the reflection coefficient is -1, then the maximum
>negative voltage is 0V (vcc + (-1*vcc)=0); eg2: output is driving 0v and
>the
>reciever end is being shorted, the reflection coefficient is -1 as well,
>would it be any reflection if the output is driving 0V with reciever end
>being shorted to ground?)
>Hope you all could shed some light here.
>Thanks.
>
>Yours Faithfully,
>LY
>
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Received on Mon Jan 10 08:49:04 2005