Fwd: Non-Monotonic Drivers

-- [ From: Ron Christopher * EMC.Ver #2.10P ] --

Forwarding following to the reflector with permission.

Ron Christopher
------- FORWARD, Original message follows -------

> Date: Tuesday, 22-Aug-95 01:38 PM
>
> From: John Brennan \ Internet: (jbrennan@vnet.ibm.com)
> To: Ron Christopher \ PRODIGY: (EGJJ77A)
>
> Subject: Non-Monotonic Drivers
>
> Arpad,
>
> The drivers Ron refers to have the following IV curve shape...
>
> Ids * *
> * *
> * *
> * *
> * ****************
> *
> *
> *
> * Vds
>
>
> Instead of the normal transistor curve shape like...
>
> Ids * ***********************
> *
> *
> *
> *
> *
> *
> *
> * Vds
>
>
> The top curve comes about because we are manipulating the gate
voltage to
> control di/dt noise in the maximum Vds region of the large output
device.
> Essentially we are translating between two Vgs curves for the output
> transistor. Hence the non-monotonicity is real and not noise related.
> Clamp diodes would add another bend in the curve and create 3 current
> values for 1 voltage value.
>
> The simulation tools we looked at would "correct" the data by making
the
> top curve look like the bottom. We saw some extreme differences in
> benchmark nets after this manipulation from the full transistor
> simulation. Since there is no standard on how to "correct" the above
> curve, we would not know how various simulation vendors would treat
the
> model.
>
> The above and the time schedule of IBIS 2.1 and CMOS 4 makes
supporting
> the IBIS modeling strategy unattractive for our CMOS 4 products.
>
> Thanks,
> John Brennan
>
>
***********************************************************************
> John Brennan Internal: jbrennan@btv
> IBM Microelectronics Internet:
jbrennan@vnet.ibm.com
> G77V/862-1 Tel: 802-769-6982 (Tie-Line:
446)
> Burlington, VT Fax: 802-769-5882 (Tie-Line:
446)
>
***********************************************************************
>
> ------- Forwarded Message
>
> Date: Tue, 22 Aug 1995 10:48:35 -0400
> From: EGJJ77A@prodigy.com (MR RONALD J CHRISTOPHER)
> To: jbrennan@VNET.IBM.COM
> Subject: Fwd: Re:
>
> - -- [ From: Ron Christopher * EMC.Ver #2.10P ] --
>
> John,
>
> This is the one that needs a technical answer on the IBIS forum.
>
> Thanks
> Ron Christopher
> - ------- FORWARD, Original message follows -------
>
> > Date: Thursday, 17-Aug-95 01:32 PM
> >
> > From: Arpad Muranyi \ Internet:
> > (arpad_muranyi@ccm.fm.intel.com)
> > To: Ron Christopher \ PRODIGY: (EGJJ77A)
> >
> > Subject: Re:
> >
> > Text item:
> >
> > Ron,
> >
> > There are many aspects to non-monotonic data. For example, some
> > non-monotonic data could be caused by noise, others by the
behavior
> of
> > the device. The former case can be solved by filtering, but the
> latter
> > case is more complicated. In order to tell you what IBIS can or
> cannot
> > do, I would like to have a little more description on those devices
> that
> > you are referring to. Can you tell me how they are non-monotonic?
> >
> > Arpad Muranyi
> > Intel Corporation
> >
>
=======================================================================
> ==
> > ======
> >
> > -- [ From: Ron Christopher * EMC.Ver #2.10P ] --
> >
> > I am working as an independent with CFI, EDAC, and Sematech on a 10
> year
> > roadmap for electronic CAD standards. Our work is described on the
> WWW at
> > http://www.cfi.org/roadmap/roadMap-eii-report.html.
> >
> > Our 10 year roadmap should show how we are going to do delay above
> the
> > chip. I thought we would be able to state IBIS, but it doesn't
> handle the
> > basic CMOS IV .5um IBM ASIC drivers. Bob Ward says Version 2.x
does
> not
> > handle all the TI drivers either. Can we establish some steps in
the
> IBIS
> > group to correct this which we could refer to in our roadmap?
> >
> > Text item: External Message Header
> >
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> >
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> >
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> > >From: EGJJ77A@prodigy.com (MR RONALD J CHRISTOPHER)
> > Date: Thu, 17 Aug 1995 10:18:59 EDT
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>
======================================================================
> >
> >
> >
>
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>
>
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> ------- End of Forwarded Message
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Received on Thu Aug 31 08:56:06 1995