Subject: Re: [IBIS-Users] RE: IBIS Question
From: Duane Mattheisen (duane.mattheisen@onsemi.com)
Date: Wed Jul 16 2003 - 14:37:55 PDT
Also some simulators may ignore the V/T Wave form tables if the "min,
Typ and max" timing delays are not in the slowest to fastest order.
Thanks Duane M
"Angulo, John" wrote:
>
> 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
> >Thread-Topic: IBIS Question
> >Thread-Index: AcNKu/D/lKDAdSc9SAWNZ5w54i/dUwAL2RIQ
> >From: "Lynne Green" <lgreen@cadence.com>
> >To: <Naftali.Refaeli@ecitele.com>
> >Cc: <ibis-users@eda.org>
> >X-Received: By mailgate.Cadence.COM as JAA22630 at Tue Jul 15 09:23:02
> 2003
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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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