Subject: RE: [IBIS-Users] RE: IBIS Question
From: Angulo, John (john_angulo@mentorg.com)
Date: Wed Jul 16 2003 - 13:52:42 PDT
The following is forwarded on behalf of Syed Huq at Cisco to work around a list administration bug:
-----Original Message-----
Some simulators may ignore the V/T Waveform tables because all the
subparameters were not provided and use the Ramp data instead.
You need to make sure 'what' your simulator used Ramp or V/T..
Syed
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>Subject: [IBIS-Users] RE: IBIS Question
>Date: Tue, 15 Jul 2003 12:23:01 -0400
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>From: "Lynne Green" <lgreen@cadence.com>
>To: <Naftali.Refaeli@ecitele.com>
>Cc: <ibis-users@eda.org>
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>Hello, Naftali,
>
>In the future, please post your questions to the IBIS reflector
>(ibis-users@eda.org). You will get faster replies, and from the best
>experts.
>
>As a general rule, V-t curves are used for actual simulations, while
>[Ramp] values are used for analytic algorithms.
>
>The IBIS spec recommends that V-t tables be generated without R_dut,
>L_dut, and C_dut.
>
>Best regards,
>Lynne
>
>-----Original Message-----
>From: Naftali.Refaeli@ecitele.com [mailto:Naftali.Refaeli@ecitele.com]
>Sent: Tuesday, July 15, 2003 3:28 AM
>To: Lynne Green
>Subject: IBIS Question
>
>
>
>Hello Lynne.
>
>May I ask an IBIS V-T question?
>
>Look at the following V-T data:
>|***********************************************************************
>|*************************
>|
>[Ramp]
>| variable typ min max
>dV/dt_r 1.52/0.81n 1.45/0.83n 1.56/0.81n
>dV/dt_f 1.43/0.68n 1.38/0.69n 1.46/0.71n
>R_load = 50.00
>|
>[Rising Waveform]
>R_fixture = 50.00
>V_fixture = 0.000
>C_fixture = 10.00pF
>R_dut = 4.77m
>L_dut = 6.95nH
>C_dut = 8.66pF
>| time V(typ) V(min) V(max)
>|
> 0.000S 0.000V 0.000V 0.000V
>1.000e-10S -42.220uV -42.220uV -71.850uV
> 0.200nS -0.501mV ...
>
>|***********************************************************************
>|*************************
>
>The IBIS "[Ramp] dtr" value is ~800pSec, while [Rising Waveform] shows
>about 1.2nsec Rise time. This is - of course - because of loading the
>I/O by C_fixture = 10.00pF, R_dut = 4.77m, L_dut = 6.95nH, C_dut =
>8.66pF
>
>But - how the simulator use the [Rising Waveform] data ?
>Does the simulator calculate "real" t_rise by using both [Ramp] and V-T
>table, or it presume that V-T data is more accurate for that
>calculation?
>
>(Embedded image moved to file: pic18969.pcx)
>
>*****************************************
>Naftali Refaeli
>Analog & High Speed Applications.
>EDS-ECI
>30 Hasivim St.
>Petah-Tikva 49133 Israel
>Tl. +972-3-9266973 Fax: +972-3-9268188
>*****************************************
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