[ibis-macro] How would you model this On Die Termination? (continuation from Question on dividing up the Tx behavior thread)

From: "Chen, Terry" <Terry.Chen@xxxxxxxxxx>
To: IBIS-ATM <ibis-macro@xxxxxxxxxxxxx>
Date: Fri, 9 Mar 2012 09:28:24 -0500

Hi IBIS experts,

I have been getting a ton of great feedbacks on why it may be a bad idea to 
model the TX driver with as an ideal output step function (b/c it will not 
model the impedance mismatch and reflections properly). To clarify, I have 
roughly sketched my TX  output driver and the T-Coil "like" ODT structure, and 
attached it as a picture in order to serve as a point for further discussion. I 
have also sketched how I am "attempting" to model it.

 So the question I have is:

1.       How would you model this?

2.       Can you do this using original IBIS 5.0 directives and still get the 
frequency dependent effect of my ODT?

I had (possibly mistakenly) thought that this is not possible with IBIS 5.0, so 
I proceeded down the path of factoring out the term and the parasitics as S4P.

Regards,
Terry Chen

Attachment: output_ODT.png
Description: output_ODT.png

Follow-Ups:
- [ibis-macro] Re: How would you model this On Die Termination? (continuation from Question on dividing up the Tx behavior thread)
  - From: ckumar
- [ibis-macro] Re: How would you model this On Die Termination? (continuation from Question on dividing up the Tx behavior thread)
  - From: James Zhou

[ibis-macro] How would you model this On Die Termination? (continuation from Question on dividing up the Tx behavior thread)

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