Re: [IBIS-Users] true differential buffer IBIS modelling

Hi Arpad

Since "Series Model" does not support reactive elements, what would be a
good way to model L and/or C present between inverting and non-inverting
pins of any true differential buffer? Specifically w.r.t IBIS-AMI, could we
consider taking s parameters of Tx and rx buffers?

thanks
Shivani

On Thu, Sep 18, 2014 at 7:38 PM, Muranyi, Arpad <Arpad_Muranyi@mentor.com>
wrote:

>  Shivani,
>
>
>
> 1)  Yes.
>
> 2)  Look at the 3D surface of Idiff, as shown in fig. 4.16 on
>
> pg. 36 in the IBIS cookbook
> http://www.eda.org/ibis/cookbook/cookbook-v4.pdf.
>
> If the surface is flat, i.e. its edges are straight you have
>
> a linear (resistive) differential current.  (It doesn’t have
>
> to be horizontal, but it should not have a curvature to it in
>
> any direction).  In this case you can use [R Series].  If there
>
> is a curvature in one or two directions, you will need to use
>
> [Series Current] or [Series MOSFET].  We do not model reactive
>
> characteristics with I-V curves, so L and C doesn’t come into
>
> this picture.
>
> 3)  Vds is the voltage between the non-inverting and inverting terminals
>
> of the buffer.  Look at pg. 51 in the IBIS Cookbook to see the
>
> explanation for Vtable.
>
> 4)  Sorry, I do not have an example for you.
>
>
>
> I hope this helps.
>
>
>
> Arpad
>
> ===========================================================================
>
>
>
>
>
> *From:* owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] *On
> Behalf Of *Shivani Sharma
> *Sent:* Thursday, September 18, 2014 4:04 AM
> *To:* ibis-users@eda.org
> *Cc:* mikelabonte@eda-stds.org
> *Subject:* [IBIS-Users] true differential buffer IBIS modelling
>
>
>
> Hi all
>
>
>
> i have a couple of queries related to IBIS modelling of truely
> differential buffers
>
>
>
> Please see-> http://www.shivanis14.blogspot.in/
>
>
>
> Thanks
>
> Shivani
>
>
>
>
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