[ibis-macro] IV and Vt curve scaling coefficient for the IBIS buffers

From: "Muranyi, Arpad" <arpad.muranyi@xxxxxxxxx>
To: <ibis-macro@xxxxxxxxxxxxx>
Date: Tue, 7 Feb 2006 12:52:32 -0800

This is in response to Ken's and Bob's emails regarding
the scaling capabilities in the IBIS buffer building
blocks of the macro library.  Looking at my code, it
seems that it would be very easy to add these capabilities
to the models.

I thought the best would be if it was compatible with the
HSPICE B-element's scaling parameters, which are:

pu_scal
pd_scal
pc_scal
gc_scal

for the IV curves, and

rwf_scal
fwf_scal

for the Vt curves.  The IV coefficients curves scale (multiply)
the current of the corresponding IV tables.  The waveform
coefficients scale (multiply) the time axis of the Vt tables,
effectively speeding up or slowing down the edge rates.  Notice
that the rising and falling edges are all scaled by the same
number to keep the Vt tables time correlated within a group.

Are there any oppositions or suggestions before I implemented
these?

Thanks,

Arpad
===========================================================

-----Original Message-----
From: Bob Ross [mailto:bob@xxxxxxxxxxxxx] 
Sent: Sunday, February 05, 2006 3:16 PM
To: kwillis@xxxxxxxxxxx
Cc: Muranyi, Arpad; ibis-macro@xxxxxxxxxxxxx
Subject: Re: [ibis-macro] Re: Suggestion for a new macro library element

Hi:

I support the concept of scaling, especially for all I-V tables
because the tables are referenced to specified voltages in
a manner that corresponds to physical scaling of strengths.

If V-T scaling is used, it should be scaled by a first order
linear equation y = ax + b to add tranlation so that the
time response is scaled with respect to a proper start of
transition time.

I like and have also used scaling.  However, there are some
technical implications and unexpected interactions, some of
which I will mention at the IBIS Summit.

Bob

Ken Willis wrote:

> Hi,
> 
> We use the VI scaling quite a bit in our SPICE-based behavioral
> MacroModeling,
> and have found it very useful.
> 
> Ken 
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[ibis-macro] IV and Vt curve scaling coefficient for the IBIS buffers

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