Subject: Re: [IBIS-Users] FW: Extreme currents????
From: Kim Helliwell (kimgh@apple.com)
Date: Wed Jul 10 2002 - 15:49:49 PDT
Frankly, I wish that suppliers of models (whether IBIS
or SPICE) would stop using these "ideal" diodes that
allow such large currents. I don't understand how anyone
can look at such results and think that's OK to ship to
customers!
Maybe they just don't look, but that's hardly an acceptable
excuse, either.
There, I feel better now!
Kim
On Wednesday, July 10, 2002, at 03:19 PM, Lynne Green wrote:
> Hello, Chris,
>
> Different EDA tools have different upper limits on currents that can be
> handled
> by the simulator.
>
> The warning is needed because "Spice" models that use the default series
> resistance (0.0 ohms) for diodes and junction leakage currents result
> in large
> IBIS table currents (often above 1 MegAmp). Most EDA tools don't go
> quite
> _that_ high.
>
> Best regards,
> Lynne
>
>
>
> -----Original Message-----
> From: John Angulo [mailto:jangulo@innoveda.com]
> Sent: Tuesday, July 09, 2002 6:02 PM
> To: ibis-users@eda.org
> Subject: [IBIS-Users] FW: Extreme currents????
>
>
> The following is forwarded on behalf of Chris DeWitt at Motorola TCG.
> Please send all private replies to Chris.Dewitt@motorola.com.
>
> John Angulo
> IBIS Open Forum Postmaster
> -----------------------------------
>
> If I run IBISCHK3 on many models I download I get an "Extreme currents
> present" warning.
>
> What are the limits on currents in the VI tables? I can't find it
> documented anywhere.
>
> Thanks
>
> Chris DeWitt
> Principal Staff Engineer
> Motorola TCG
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Kim Helliwell
Apple Computer
kimgh@apple.com
408 974 9936
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