RE: [SI-LIST] : High Speed Design by Rules of Thumb vs. Simulation

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From: Steve Ting (Ting.Steve@inventec.com)
Date: Wed Feb 23 2000 - 00:50:46 PST


Hi! Abe,
Yes, I think the tool's capabilities plays an very important role if you
rely so much on simulation.
For instance, in some cases, the decoupling caps will seem unnecessary
from the SI point of view with some simulation tool that cannot deal
with return path / plane noise. And if you try to remove the
"unnecessary" caps based on this kind of simulation, you might have EMI
problem.

And as I know, there're few simulation tools can deal with return path /
plane noises well.

RGS,
Steve Ting
SI engineer
Inventec corp, Taiwan, R.O.C.

-----Original Message-----
From: Abe Riazi [ mailto:ariazi@anigma.com <mailto:ariazi@anigma.com> ]
Sent: Monday, February 21, 2000 12:48 AM
To: 'si-list@silab.eng.sun.com'
Subject: RE: [SI-LIST] : High Speed Design by Rules of Thumb vs.
Simulation

Steve Weir Wrote:

This all sounds like "motherhood and apple pie" to me. Unless I missed
something, it sounds like:

1. We trade economy in the design and validation processes against
economy
and risk further down the product life cycle.
2. Success requires care and diligence in the trade-offs, and validation

of
the results.

I think those who are successful are those who are either very lucky, or

those who get it and do the job. It's a subset of TQM.

Hi Steve:

Thank you for your response.

A main objective of my post was to discuss possible solutions to
following types of questions:

Under what conditions is it necessary to simulate during the course of a

high speed PCB design?

What are the pros and cons of a high speed digital design based solely
on rules of thumb?

By what means can efficiency of a SI simulation be optimized?

Now the complete answer to above can be quite lengthy encompassing many
considerations and concepts, but as it was pointed out some key elements

of the solution include:

  "Critical length"
  "Scaling"
  Economical considerations
  Development of a versatile model library
  Formulation of a comprehensive "simulation plan"

Additionally, the capabilities of the simulator program also plays an
important role in this puzzle.

 Regards,

 Abe
 ariazi@animga.com
 ARIAZI@prodigy.net
   

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